Exhibit 13


MANAGEMENT'S DISCUSSION AND ANALYSIS OF OPERATIONS AND
FINANCIAL CONDITION


NET SALES

Consolidated net sales in 1999 totaled $9.2 billion, an

increase of 14 percent over 1998, due to volume growth

of 13 percent and price increases of 1 percent.

Foreign exchange had a less than 1 percent impact on

the sales increase.  Net sales in the United States

increased 14 percent versus 1998 and advanced 13

percent internationally.  Foreign exchange negatively

impacted the international sales growth by 1 percent.



Consolidated 1998 net sales of $8.1 billion advanced 19

percent over 1997, reflecting volume growth of 19

percent and price increases of 2 percent, tempered by

unfavorable foreign exchange of 2 percent.  The

acquisition of the Mallinckrodt Inc. animal health

business in June 1997 favorably impacted sales growth

by 3 percent.  The sales of this business were included

for only half the year in 1997 and for the full year in

1998.



Net sales by major therapeutic category for the years

ended 1999, 1998 and 1997 were as follows ($ in

millions):



                                                      % Increase (Decrease)
                              1999     1998     1997    1999/98    1998/97
                                                       
Allergy & Respiratory       $3,850   $3,375   $2,708       14%        25 %
Anti-infective & Anticancer  1,738    1,263    1,156       38          9
Dermatologicals                682      619      571       10          8
Cardiovasculars                673      750      637      (10)        18
Other Pharmaceuticals          792      688      649       16          6
Animal Health                  678      647      389        5         66
Foot Care                      348      336      300        3         12
Over-the-Counter (OTC)         221      218      220        1         (1)
Sun Care                       194      181      148        7         22
Consolidated net sales      $9,176   $8,077   $6,778       14%        19 %



Worldwide net sales of allergy and respiratory products

increased 14 percent in 1999 and 25 percent in 1998,

due to continued strong market growth for the CLARITIN

line of nonsedating antihistamines.  Worldwide net

sales of the CLARITIN brand totaled $2.7 billion in

1999, $2.3 billion in 1998 and $1.7 billion in 1997.

Franchise sales of nasal inhaled steroid products,

which include VANCENASE allergy products and NASONEX, a

once-daily corticosteroid for allergic rhinitis,

increased in 1999 and 1998 due to market expansion in

the United States and the launch of NASONEX in several

international markets.  Sales of VANCERIL, an orally

inhaled steroid for asthma, declined $14 million in

1999 due to manufacturing issues and branded

competition.



Net sales of worldwide anti-infective and anticancer

products rose 38 percent compared with 1998. Growth was

led by combined worldwide sales of INTRON A (interferon

alfa-2b) and REBETRON Combination Therapy, containing

REBETOL (ribavirin) Capsules and INTRON A Injection,

which totaled $1.1 billion, up 56 percent from 1998.

Sales of these products grew because of increased use

in the treatment of chronic hepatitis C. The U.S. and

international launches of TEMODAR, a chemotherapy agent

for treating certain types of brain tumors, also

contributed to the increase in this therapeutic

category's sales in 1999.  These sales increases were

moderated by lower sales of EULEXIN, a prostate cancer

therapy, due to generic and branded competition.  In

1998, worldwide net sales of anti-infective and

anticancer products increased 9 percent due to INTRON A

and the mid-year 1998 introduction of REBETRON

Combination Therapy in the United States.  This

increase was moderated by lower sales of EULEXIN due to

generic and branded competition.



Dermatological products' worldwide net sales increased

10 percent in 1999 and 8 percent in 1998, due to higher

sales of LOTRISONE, an antifungal/anti-inflammatory

cream, and ELOCON, a medium-potency topical steroid.



Worldwide net sales of cardiovascular products declined

10 percent in 1999, due to generic competition in the

United States against IMDUR, an oral nitrate for

angina, and NORMODYNE, an alpha-beta blocker for

hypertension.  Partially offsetting these declines were

higher U.S. sales of INTEGRILIN, a platelet receptor

glycoprotein IIb/IIIa inhibitor, due to increased

market penetration following its launch in the second

quarter of 1998.  Sales of K-DUR, a sustained-release

potassium chloride supplement, increased in 1999 due to

market share growth.  In 1998, worldwide net sales of

cardiovascular products advanced 18 percent, reflecting

U.S. market expansion and market share growth for IMDUR

and K-DUR.



Other pharmaceuticals consist of products that do not

fit into the Company's major therapeutic categories,

such as SUBUTEX, a treatment for opiate addiction, and

revenues received from Novo Nordisk related to the

Company's co-promotion agreement for PRANDIN, an oral

antidiabetic agent.



Worldwide sales of animal health products increased 5

percent in 1999. Sales growth was driven by NUFLOR, a

broad-spectrum, multi-species antibiotic, and BANAMINE,

a non-steroidal anti-inflammatory agent.  Sales of

animal health products in 1998 increased 66 percent

over 1997.  Adjusting for the 1997 acquisition of the

Mallinckrodt animal health business, 1998 sales would

have increased 12 percent.  Sales growth in 1998 was

again driven by BANAMINE and NUFLOR.



Foot care product sales rose 3 percent in 1999 led by

increases in the DR. SCHOLL'S insoles product line due

to new product introductions and line extensions.

Sales grew 12 percent in 1998, reflecting increases in

the DR. SCHOLL'S and antifungal product lines.



Over-the-counter (OTC) product sales increased 1

percent in 1999 due to a strong spring cough/cold

season.  OTC product sales decreased slightly in 1998.



Sun care sales were up 7 percent in 1999 primarily due

to market growth. In 1998, sales grew 22 percent due to

early 1999 season purchases.



SUMMARY OF COSTS AND EXPENSES:
(Dollars in millions)


                                                                % Increase
                            1999         1998         1997    1999/98  1998/97
                                                         
Cost of sales . . . . . . $1,800       $1,601       $1,308     12 %     22 %
% of net sales. . . . . .   19.6 %       19.8 %       19.3 %

Selling, general and
 administrative . . ..  . $3,434       $3,141       $2,664      9 %     18 %
% of net sales. . . . . .   37.4 %       38.9 %       39.3 %

Research and development. $1,191       $1,007       $  847     18 %     19 %
% of net sales. . . . . .   13.0 %       12.5 %       12.5 %




Cost of sales as a percentage of net sales in 1999

decreased slightly versus 1998, due to favorable sales

mix.  The increase of 1998 cost of sales as a

percentage of net sales versus 1997 reflects higher

royalties and the inclusion of Mallinckrodt animal

health products, which generally have lower gross

margins.



Selling, general and administrative expenses in 1999

and 1998 decreased as a percentage of sales as sales

growth outpaced expansion of the field force and

increased promotional and selling-related spending.



Research and development expenses grew 18 percent to

$1.2 billion and represented 13.0 percent of sales in

1999.  In 1998, research and development expenses

increased 19 percent over 1997 and represented 12.5

percent of sales.  The higher spending in both years

reflects the Company's funding of both internal

research efforts and research collaborations with

various partners to develop a steady flow of innovative

products.  The Company expects research and development

spending for 2000 to increase by approximately 15

percent.



INCOME BEFORE INCOME TAXES

Income  before  income taxes totaled  $2.8  billion  in

1999,  an  increase of 20 percent over 1998.  In  1998,

income  before  income taxes was $2.3  billion,  up  22

percent over $1.9 billion in 1997.



INCOME TAXES

The Company's effective tax rate was 24.5 percent for

the years 1999, 1998 and 1997.  The effective tax rate

for each period was lower than the U.S. statutory

income tax rate principally due to tax incentives in

certain jurisdictions where manufacturing facilities

are located.  For additional information, see "Income

Taxes" in the Notes to Consolidated Financial

Statements.



NET INCOME

Net income in 1999 increased 20 percent to $2.1

billion.  Net income in 1998 increased 22 percent over

1997.  Differences in year-to-year exchange rates had a

less than 1 percent impact on net income growth in

1999.  After eliminating exchange differences in 1998,

net income would have risen approximately 24 percent.



EARNINGS PER COMMON SHARE

Diluted earnings per common share rose 20 percent in

1999 to $1.42 and 22 percent in 1998 to $1.18.  Foreign

currency exchange had no impact on 1999 diluted

earnings per common share.  The strengthening of the

U.S. dollar against most foreign currencies decreased

growth in earnings per common share in 1998.  Excluding

the impact of exchange rate fluctuations, diluted

earnings per common share would have increased

approximately 24 percent in 1998.  Basic earnings per

common share increased 20 percent in 1999 to $1.44 and

22 percent in 1998 to $1.20.



Under existing share repurchase programs authorized by

the Board of Directors, approximately 18 million common

shares were repurchased during 1999, 1998 and 1997.  A

$1 billion program was authorized in September 1997 and

commenced in January 1998.  At December 31, 1999,

approximately 13.3 million shares had been acquired

under the 1997 authorization and the program was

approximately 65 percent complete.



YEAR 2000

Many computer systems ("IT systems") and equipment and

instruments with embedded microprocessors ("non-IT

systems") had been designed to recognize only the last

two digits of a calendar year.  As previously reported,

the Company undertook an extensive project to remediate

or replace its date-sensitive IT and non-IT systems.

These systems have functioned properly since the first

of the year and management believes that future

operations will be unaffected by these matters.  The

Company did not experience any significant increase in

product sales as a result of Year 2000 concerns.



As of December 31, 1999, the Company spent $66 million

on the Year 2000 remediation/replacement project; $20

million has been capitalized and $46 million has been

expensed.  The expense for 1999 was $17 million, which

is approximately 10 percent of the Company's overall

annual information systems budget.  Additional costs to

repair or replace non-critical, non-IT equipment will

continue into the year 2000, but the costs are not

expected to be significant.



The estimates and conclusions in this description of

the Year 2000 issue contain forward-looking statements

and are based on management's estimates of future

events.



EURO

On January 1, 1999, certain member countries of the

European Union established a new common currency, the

euro.  Also on January 1, 1999, the participating

countries fixed the rate of exchange between their

existing legacy currencies and the euro.  The new euro

currency will eventually replace the legacy currencies

currently in use in each of the participating

countries.  Euro bills and coins will not be issued

until January 1, 2002.



Companies operating within the participating countries

may, at their discretion, choose to operate in either

legacy currencies or the euro until January 1, 2002.

The Company expects the majority of its affected

subsidiaries to continue to operate in their respective

legacy currencies during the next two years.  The

Company can, however, accommodate transactions for

customers and suppliers operating in either legacy

currency or euros.



The Company believes that the creation of the euro will

not significantly change its market risk with respect

to foreign exchange.  Having a common European currency

may result in certain changes to competitive practices,

product pricing and marketing strategies.  Although we

are unable to quantify these effects, if any,

management at this time does not believe the creation

of the euro will have a material effect on the Company.



ACQUISITION

In June 1997, the Company acquired the worldwide animal

health operations of Mallinckrodt Inc. for

approximately $490 million, which includes the

assumption of debt and direct costs of the acquisition.

The addition of the Mallinckrodt operations has created

broader product lines and expanded geographic

distribution capabilities for our animal health

products.  For additional information, see

"Acquisition" in the Notes to Consolidated Financial

Statements.



ENVIRONMENTAL MATTERS

The Company has obligations for environmental clean-up

under various state, local and federal laws, including

the Comprehensive Environmental Response, Compensation

and Liability Act, commonly known as Superfund.

Environmental expenditures have not had and, based on

information currently available, are not anticipated to

have a material impact on the Company.  For additional

information, see "Legal and Environmental Matters" in

the Notes to Consolidated Financial Statements.



ADDITIONAL FACTORS INFLUENCING OPERATIONS

In the United States, many of the Company's

pharmaceutical products are subject to increasingly

competitive pricing as managed care groups,

institutions, government agencies and other buying

groups seek price discounts.  In most international

markets, the Company operates in an environment of

government-mandated cost-containment programs.  Several

governments have placed restrictions on physician

prescription levels and patient reimbursements,

emphasized greater use of generic drugs and enacted

across-the-board price cuts as methods to control

costs.



Since the Company is unable to predict the final form

and timing of any future domestic and international

governmental or other health care initiatives, their

effect on operations and cash flows cannot be

reasonably estimated.  Similarly, the effect on

operations and cash flows of decisions of managed care

groups and other buying groups concerning formularies,

pharmaceutical reimbursement policies and availability

of the Company's pharmaceutical products cannot be

reasonably estimated.



The market for pharmaceutical products is competitive.

The Company's operations may be affected by

technological advances of competitors, industry

consolidation, patents granted to competitors, new

products of competitors and generic competition as the

Company's products mature.  In addition, patent

positions are increasingly being challenged by

competitors, and the outcome can be highly uncertain.

An adverse result in a patent dispute can preclude

commercialization of products or negatively affect

sales of existing products.  The effect on operations

of competitive factors and patent disputes cannot be

predicted.



Uncertainties inherent in government regulatory

approval processes, including, among other things,

delays in approval of new products, may also affect the

Company's operations.  The effect on operations of

regulatory approval processes cannot be predicted.



The Company is subject to the jurisdiction of various

national, state and local regulatory agencies and is,

therefore, subject to potential administrative actions.

Of particular importance is the Food and Drug

Administration (FDA) in the United States.  It has

jurisdiction over all the Company's businesses and

administers requirements covering the testing, safety,

effectiveness, approval, manufacturing, labeling and

marketing of the Company's products.  From time to

time, agencies, including the FDA, may require the

Company to address various manufacturing, advertising,

labeling or other regulatory issues.  Failure to comply

with governmental regulations can result in delays in

the release of products, seizure or recall of products,

suspension or revocation of the authority necessary for

the production and sale of products, fines and other

civil or criminal sanctions.



From time to time, the Company has received Warning

Letters from the FDA pertaining to various

manufacturing issues.  Among these, the Company has

received a Warning Letter from the FDA relating

specifically to manufacturing issues identified during

FDA inspections of the Company's aerosol products

(albuterol and VANCERIL) manufacturing facilities in

New Jersey.  The Company is implementing remedial

actions at these facilities.  The Company has met with

the FDA on several occasions to apprise the agency of

the scope and status of these activities.  An FDA

inspection of the Company's New Jersey manufacturing

facilities is ongoing.  The Company cannot predict

whether its remedial actions will resolve the FDA's

concerns, whether the FDA will take any further action

or the effect of this matter on the Company's

operations.



Under certain circumstances, the Company may deem it

advisable to initiate product recalls.  In 1999, the

Company voluntarily chose to initiate several recalls,

including a recall of certain shipments of albuterol

and VANCERIL manufactured at its New Jersey facilities.



LIQUIDITY AND FINANCIAL RESOURCES

Cash generated from operations continues to be the

Company's major source of funds to finance working

capital, capital expenditures, acquisitions,

shareholder dividends and common share repurchases.



Cash provided by operating activities totaled $1,893

million in 1999, $2,026 million in 1998 and $1,845

million in 1997.  Year-to-year changes in cash provided

by operating activities result from the timing of

receipts and disbursements as well as from an overall

net investment in working capital necessitated by the

growth in the business.



Capital expenditures amounted to $543 million in 1999,

$389 million in 1998 and $405 million in 1997.

Commitments for future capital expenditures totaled

$179 million at December 31, 1999.



Cash flow related to financing activities included

equity proceeds as well as proceeds from short-term

borrowings.    Common shares repurchased in 1999

totaled 9.9 million shares at a cost of $504 million.

In 1998, 3.4 million shares were repurchased for $141

million and, in 1997, 4.8 million shares were

repurchased at a cost of $132 million.



Dividend payments of $716 million were made in 1999,

compared with $627 million in 1998 and $542 million in

1997.  Dividends per common share were $0.485 in 1999,

up from $0.425 in 1998 and $0.368 in 1997.



Cash and cash equivalents totaled $1,876 million,

$1,259 million and $714 million at December 31, 1999,

1998 and 1997, respectively.  Short-term borrowings and

current portion of long-term debt totaled $728 million

at year-end 1999, $558 million in 1998 and $581 million

in 1997.



The Company's ratio of debt to total capital remained

at 12 percent in 1999. The Company's liquidity and

financial resources continued to be sufficient to meet

its operating needs.  As of December 31, 1999, the

Company had $1.2 billion in unused lines of credit,

including $876 million available under the $1 billion

multi-currency unsecured revolving credit facility

expiring in 2001.  The Company had A-1+ and P-1 ratings

for its commercial paper, and AA and Aa2 general bond

ratings from Standard & Poor's and Moody's,

respectively, as of December 31, 1999.



MARKET RISK DISCLOSURES

The Company is exposed to market risk primarily from

changes in foreign currency exchange rates and, to a

lesser extent, from interest rates.  The following

describes the nature of the risks and demonstrates

that, in general, such market risk is not material to

the Company.



Foreign Currency Exchange Risk

The Company operates in more than 40 countries

worldwide.  In 1999, sales outside the United States

accounted for approximately 36 percent of worldwide

sales.  Virtually all these sales were denominated in

currencies of the local country.  As such, the

Company's reported profits and cash flows are exposed

to changing exchange rates.  In 1999, changes in

foreign exchange rates reduced sales by less than 1

percent and had no impact on 1999 diluted earnings per

common share.



To date, management has not deemed it cost-effective to

engage in a formula-based program of hedging the

profits and cash flows of foreign operations using

derivative financial instruments.  Because the

Company's foreign subsidiaries purchase significant

quantities of inventory payable in U.S. dollars,

managing the level of inventory and related payables

and the rate of inventory turnover provides a level of

protection against adverse changes in exchange rates.

In addition, the risk of adverse exchange rate change

is mitigated by the fact that the Company's foreign

operations are widespread.  The widespread nature of

the Company's foreign operations is the primary reason

that the overall economic weakness in certain Latin

American countries is not expected to significantly

impact future operations of the Company.



In addition, at any point in time, the Company's

foreign subsidiaries hold financial assets and

liabilities that are denominated in currencies other

than U.S. dollars.  These financial assets and

liabilities consist primarily of short-term, third-

party and intercompany receivables and payables.

Changes in exchange rates affect these financial assets

and liabilities.  For the most part, however, gains or

losses arise from translation and, as such, do not

significantly affect net income.



On occasion, the Company has used derivatives to hedge

specific short-term risk situations involving foreign

currency exposures.  However, these derivative

transactions have not been material.



Interest Rate and Equity Price Risk

The financial assets of the Company that are exposed to

changes in interest rates and equity prices include

debt and equity securities held in non-qualified trusts

for employee benefits and equity securities acquired in

connection with in-licensing arrangements. The trust

investments totaled approximately $185 million at

December 31, 1999.  Due to the long-term nature of the

liabilities that these assets fund, the Company's

exposure to market risk is low.  A decline in market

value of these investments would not necessitate any

near-term funding of the trusts.  In connection with

certain research and development in- licensing

arrangements, on occasion the Company acquires equity

securities of the licensee company.  These investments

are generally accounted for as available-for-sale and,

as such, carried at market value.  The total market

value of these investments at December 31, 1999, was

$119 million. See "Financial Instruments" in the Notes

to Consolidated Financial Statements for additional

information.  The other financial assets of the Company

do not give rise to significant interest rate risk due

to their short duration.



The financial obligations of the Company that are

exposed to changes in interest rates are generally

limited to short-term borrowings and a $200 million

equity-type security issued in 1999. All other

borrowings are not significant.  Although the

borrowings are, for the most part, floating rate

obligations, the interest rate risk posed by these

borrowings is low because the amount of this obligation

is small in relation to annual cash flow.  The Company

has the ability to pay off these borrowings quickly if

interest rates were to increase significantly.



Interest Rate Swaps

In 1991 and 1992, the Company utilized interest rate

swaps as part of its international cash management

strategy.  For additional information, see "Financial

Instruments" in the Notes to Consolidated Financial

Statements.  These swaps subject the Company to a

moderate degree of market risk.  The Company accounts

for these swaps using fair value accounting, with

changes in the fair value recorded in earnings.  The

fair value of these swaps was an asset of $1 million at

December 31, 1999.  The fair value of these swaps at

December 31, 1998, was less than $100 thousand.  It is

estimated that a 10 percent change in interest rate

structure could change the fair value of the swaps by

approximately $2 million.



During 1999, the Company purchased a $200 million

variable rate, three-month time deposit.  The Company

intends to roll over this time deposit every three

months until November 2003.  To hedge the future

variable interest receipts on this time deposit, the

Company entered into an interest rate swap that matures

in November 2003.  Under this swap, the Company

receives a fixed rate and pays a three-month variable

rate.  The fair value of this swap was a $6 million

liability at December 31, 1999.  It is estimated that a

10 percent change in interest rate structure could

change the fair value of the swap by approximately $5

million.



CAUTIONARY FACTORS THAT MAY AFFECT FUTURE RESULTS

This annual report and other written reports and oral

statements made from time to time by the Company may

contain so-called "forward-looking statements," all of

which are subject to risks and uncertainties.  One can

identify these forward-looking statements by the use of

such words as "expects," "plans," "will," "estimates,"

"forecasts," "projects," "believes" and other words of

similar meaning.  One also can identify them by the

fact that they do not relate strictly to historical or

current facts.  These statements are likely to address

the Company's growth strategy, financial results,

regulatory issues, product approvals, development

programs, litigation and investigations.  One must

carefully consider any such statement and should

understand that many factors could cause actual results

to differ from the Company's forward-looking

statements.  These factors include inaccurate

assumptions and a broad variety of other risks and

uncertainties, including some that are known and some

that are not.  No forward-looking statement can be

guaranteed, and actual future results may vary

materially.



The Company does not assume the obligation to update

any forward-looking statement.  One should carefully

evaluate such statements in light of factors described

in the Company's filings with the Securities and

Exchange Commission, especially on Forms 10-K, 10-Q and

8-K (if any).  In Item 1 of the Company's annual report

on Form 10-K for the year ended December 31, 1999, the

Company discusses in more detail various important

factors that could cause actual results to differ from

expected or historic results.  The Company notes these

factors for investors as permitted by the Private

Securities Litigation Reform Act of 1995.  One should

understand that it is not possible to predict or

identify all such factors.  Consequently, the reader

should not consider any such list to be a complete

statement of all potential risks or uncertainties.












SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES


STATEMENTS OF CONSOLIDATED INCOME
(Amounts in millions, except per share figures)


For the Years Ended December 31,                          1999      1998      1997
                                                                   
Net sales . . . . . . . . . . . . . . . . . . .         $9,176    $8,077    $6,778

Costs and Expenses:

   Cost of sales  . . . . . . . . . . . . . . .          1,800     1,601     1,308
   Selling, general and administrative. . . . .          3,434     3,141     2,664
   Research and development . . . . . . . . . .          1,191     1,007       847
   Other (income) expense, net. . . . . . . . .            (44)        2        46
   Total costs and expenses . . . . . . . . . .          6,381     5,751     4,865

Income before income taxes  . . . . . . . . . .          2,795     2,326     1,913
      Income taxes  . . . . . . . . . . . . . .            685       570       469

Net income. . . . . . . . . . . . . . . . . . .         $2,110    $1,756    $1,444

Diluted earnings per common share . . . . . . .          $1.42    $ 1.18      $.97

Basic earnings per common share . . . . . . . .          $1.44    $ 1.20      $.98

See Notes to Consolidated Financial Statements.







SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES



STATEMENTS OF CONSOLIDATED CASH FLOWS
(Amounts in millions)



For the Years Ended December 31,                        1999        1998        1997
                                                                      
Operating Activities:

  Net income . . . . . . . . . . . . . . . . . . .     $2,110      $1,756      $1,444
  Depreciation and amortization  . . . . . . . . .        264         238         200
  Accounts receivable  . . . . . . . . . . . . . .       (352)        (67)        (40)
  Inventories  . . . . . . . . . . . . . . . . . .       (150)       (102)        (43)
  Prepaid expenses and other assets. . . . . . . .        (76)       (116)       (127)
  Accounts payable and other liabilities . . . . .         97         317         411

  Net cash provided by operating activities  . . .      1,893       2,026       1,845

Investing Activities:

  Capital expenditures . . . . . . . . . . . . . .       (543)       (389)       (405)
  Purchases of investments . . . . . . . . . . . .       (338)       (319)        (77)
  Reduction of investments . . . . . . . . . . . .        215           -          36
  Purchase of business, net of cash acquired . . .          -           -        (354)
  Other, net . . . . . . . . . . . . . . . . . . .          3           -          (8)

  Net cash used for investing activities . . . . .       (663)       (708)       (808)

Financing Activities:

  Cash dividends paid to common shareholders . . .       (716)       (627)       (542)
  Common shares repurchased  . . . . . . . . . . .       (504)       (141)       (132)
  Net change in short-term borrowings  . . . . . .        187         (19)       (290)
  Repayment of long-term debt  . . . . . . . . . .         (2)        (42)         (1)
  Other, net, primarily equity proceeds. . . . . .        424          57         116

  Net cash used for financing activities . . . . .       (611)       (772)       (849)

Effect of exchange rates on cash and cash equivalents      (2)         (1)         (9)

Net increase in cash and cash equivalents  . . . .        617         545         179

Cash and cash equivalents, beginning of year . . .      1,259         714         535

Cash and cash equivalents, end of year . . . . . .     $1,876      $1,259       $ 714

See Notes to Consolidated Financial Statements.








SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES



CONSOLIDATED BALANCE SHEETS
(Amounts in millions, except per share figures)



At December 31,                                          1999         1998
                                                               
ASSETS

Current Assets:

     Cash and cash equivalents . . . . . . . .          $1,876       $1,259

     Accounts receivable, less allowances:
      1999, $92; 1998, $98 . . . . . . . . . .           1,022          704

     Inventories   . . . . . . . . . . . . . .             958          841

     Prepaid expenses, deferred income taxes
      and other current assets . . . . . . . .           1,053        1,154

     Total current assets  . . . . . . . . . .           4,909        3,958

Property, at cost:

     Land    . . . . . . . . . . . . . . . . .              50           48

     Buildings and improvements  . . . . . . .           1,922        1,836

     Equipment . . . . . . . . . . . . . . . .           1,760        1,677

     Construction in progress  . . . . . . . .             654          507


     Total . . . . . . . . . . . . . . . . . .           4,386        4,068

     Less accumulated depreciation . . . . . .           1,447        1,393

     Property, net . . . . . . . . . . . . . .           2,939        2,675

Intangible assets, net . . . . . . . . . . . .             588          565

Other assets . . . . . . . . . . . . . . . . .             939          642

                                                        $9,375       $7,840



                                                            1999       1998

LIABILITIES AND SHAREHOLDERS' EQUITY

Current Liabilities:

   Accounts payable  . . . . . . . . . . . . . . . . .    $  966     $1,003

   Short-term borrowings and current portion of
    long-term debt   . . . . . . . . . . . . . . . . .       728        558

   U.S., foreign and state income taxes  . . . . . . .       502        505

   Accrued compensation  . . . . . . . . . . . . . . .       301        279

   Other accrued liabilities . . . . . . . . . . . . .       712        687

   Total current liabilities . . . . . . . . . . . . .     3,209      3,032

Long-term Liabilities:

   Deferred income taxes . . . . . . . . . . . . . . .       284        291

   Other long-term liabilities . . . . . . . . . . . .       717        515

   Total long-term liabilities . . . . . . . . . . . .     1,001        806

Shareholders' Equity:

   Preferred shares - authorized shares: 50,
    $1 par value; issued: none . . . . . . . . . . . .         -          -

   Common shares - authorized shares:
    2,400, $.50 par value; issued: 2,030 . . . . . . .     1,015      1,015

   Paid-in capital . . . . . . . . . . . . . . . . . .       675        365

   Retained earnings . . . . . . . . . . . . . . . . .     8,196      6,802

   Accumulated other comprehensive income  . . . . . .      (233)      (238)

   Total . . . . . . . . . . . . . . . . . . . . . . .     9,653      7,944

   Less treasury shares: 558, at cost  . . . . . . . .     4,488      3,942

   Total shareholders' equity  . . . . . . . . . . . .     5,165      4,002

                                                          $9,375     $7,840

See Notes to Consolidated Financial Statements.








SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES



STATEMENTS OF CONSOLIDATED SHAREHOLDERS' EQUITY
(Amounts in millions)

                                                                  Accumulated
                                                                       Other        Total
                                                                       Compre-      Share-
                              Common    Paid-in   Retained   Treasury  hensive      holders'
                              Shares    Capital   Earnings   Shares    Income       Equity
                                                                  
Balance December 31, 1996       $507      $172     $5,081    $(3,560)   $(140)      $2,060

Comprehensive income:
 Net income                                         1,444                            1,444
 Foreign currency translation,
  net of tax                                                             (101)        (101)
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                            (3)          (3)
   Total comprehensive income                                                        1,340
Cash dividends on common
  shares                                             (542)                            (542)
Stock incentive plans                      122                   (27)                   95
Common shares repurchased                                       (132)                 (132)
Effect of 2-for-1 stock split    508      (198)      (310)

Balance December 31, 1997      1,015        96      5,673     (3,719)    (244)       2,821

Comprehensive income:
 Net income                                         1,756                            1,756
 Foreign currency translation,
  net of tax                                                                5            5
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                             1            1
   Total comprehensive income                                                        1,762
Cash dividends on common
  shares                                             (627)                            (627)
Stock incentive plans                      269                   (82)                  187
Common shares repurchased                                       (141)                 (141)

Balance December 31, 1998      1,015       365      6,802     (3,942)    (238)       4,002


Comprehensive income:
 Net income                                         2,110                            2,110
 Foreign currency translation,
  net of tax                                                              (54)         (54)
 Unrealized gain (loss) on
  investments held available
  for sale, net                                                            59           59
   Total comprehensive income                                                        2,115
Cash dividends on common
  shares                                             (716)                            (716)
Stock incentive plans                      310                   (42)                  268
Common shares repurchased                                       (504)                 (504)
Balance December 31, 1999     $1,015      $675     $8,196    $(4,488)  $ (233)      $5,165

See Notes to Consolidated Financial Statements.








NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(Dollars in millions, except per share figures)

ACCOUNTING POLICIES

Principles of Consolidation - The consolidated
financial statements include Schering-Plough
Corporation and its subsidiaries.  Intercompany
balances and transactions are eliminated.  Certain
prior year amounts have been reclassified to conform to
the current year presentation.

Use of Estimates - The preparation of financial
statements in conformity with generally accepted
accounting principles requires management to make
estimates and use assumptions that affect certain
reported amounts and disclosures; actual amounts may
differ.

Cash and Cash Equivalents - Cash and cash equivalents
include operating cash and highly liquid investments,
generally with maturities of three months or less.

Inventories - Inventories are valued at the lower of
cost or market.  Cost is determined by using the last-
in, first-out method for a substantial portion of
inventories located in the United States.  The cost of
all other inventories is determined by the first-in,
first-out method.

Depreciation - Depreciation is provided over the
estimated useful lives of the properties, generally by
use of the straight-line method.  Average useful lives
are 50 years for buildings, 25 years for building
improvements and 12 years for equipment.  Depreciation
expense was $208, $191 and $166 in 1999, 1998 and 1997,
respectively.

Intangible Assets - Intangible assets principally
include goodwill, licenses, patents and trademarks.
Intangible assets are recorded at cost and amortized on
the straight-line method over periods not exceeding 40
years.  Accumulated amortization of intangible assets
was $188 and $138 at December 31, 1999 and 1998,
respectively.  Intangible assets are periodically
reviewed to determine recoverability by comparing their
carrying values to undiscounted expected future cash
flows.

Foreign Currency Translation - The net assets of most
of the Company's foreign subsidiaries are translated
into U.S. dollars using current exchange rates.  The
U.S. dollar effects that arise from translating the
net assets of these subsidiaries at changing rates are
recorded in the foreign currency translation adjustment
account, which is included in other comprehensive
income.  For the remaining foreign subsidiaries,
non-monetary assets and liabilities are translated
using historical rates, while monetary assets and
liabilities are translated at current rates, with the
U.S. dollar effects of rate changes included in income.
Exchange gains and losses arising from translating
intercompany balances of a long-term investment nature
are recorded in the foreign currency translation
adjustment account.  Other exchange gains and losses
are included in income.

Net foreign exchange losses included in income were $6,
$2 and $6 in 1999, 1998 and 1997, respectively.

Accumulated Other Comprehensive Income - Accumulated
other comprehensive income consists of the accumulated
foreign currency translation adjustment account and
accumulated unrealized gains and losses on securities
classified for Statement of Financial Accounting
Standards (SFAS) No. 115 purposes as held available for
sale. At December 31, 1999 and 1998, the accumulated
foreign currency translation adjustment account, net of
tax, totaled $301 and $247, respectively.

Revenue Recognition - Revenues from the sale of
products are recorded at the time goods are shipped to
customers.

Earnings Per Common Share -  Diluted earnings per
common share are computed by dividing income by the sum
of the weighted-average number of common shares
outstanding plus the dilutive effect of shares issuable
through deferred stock units and the exercise of stock
options.  Basic earnings per common share are computed
by dividing income by the weighted-average number of
common shares outstanding.

The shares used to calculate basic earnings per common
share and diluted earnings per common share are
reconciled as follows:



                                                     (shares in millions)
                                                   1999       1998      1997
                                                              
Average shares outstanding
  for basic earnings per share . . . .             1,470     1,468     1,464

Dilutive effect of options
  and deferred stock units . . . . . .                16        20        16

Average shares outstanding
  for diluted earnings per share . . .             1,486     1,488     1,480



As of December 31, 1999, there were 9 million options
outstanding with exercise prices higher than the
average price of the Company's common stock during
1999.  Accordingly, these options are not included in
the dilutive effects indicated above.


Recently Issued Accounting Standard - In June 1998, the
Financial Accounting Standards Board (FASB) issued SFAS
No. 133, "Accounting for Derivative Instruments and
Hedging Activities."  SFAS No. 133, as amended by SFAS
No. 137, requires adoption by the Company no later than
January 1, 2001.  The Company plans to adopt SFAS No.
133 at that time.  This statement is not expected to
materially impact the Company's financial statements
because the Company makes limited use of derivative
financial instruments.

ACQUISITION

On June 30, 1997, the Company acquired the worldwide
animal health business of Mallinckrodt Inc. for
approximately $490, which includes the assumption of
debt and direct costs of the acquisition.  The
acquisition was recorded under the purchase method of
accounting.  The excess of the purchase price over the
fair value of identifiable net assets acquired is
included in intangible assets, net.  The results of
operations of the purchased animal health business have
been included in the Company's Statements of
Consolidated Income from the date of acquisition.  Pro
forma results of the Company, assuming the acquisition
had been made at the beginning of each period
presented, would not be materially different from the
results reported.

FINANCIAL INSTRUMENTS

The table below presents the carrying values and
estimated fair values for the Company's financial
instruments, including derivative financial
instruments.  Estimated fair values were determined
based on market prices, where available, or dealer
quotes.



                                 December 31, 1999        December 31, 1998
                               Carrying    Estimated    Carrying  Estimated
                                Value     Fair Value     Value   Fair Value
                                                       
ASSETS:
Cash and cash equivalents       $1,876       $1,876      $1,259    $1,259
Debt and equity investments        532          532         213       213
Interest rate swap contracts         6           (6)          -         -

LIABILITIES:
Short-term borrowings and
  current portion of long-
  term debt                        728          728         558       558
Long-term debt                       6            6           4         4
Other financing instruments        208          193           -         -



Credit and Market Risk

Most financial instruments expose the holder to credit
risk for non-performance and to market risk for changes
in interest and currency rates.  The Company mitigates
credit risk on derivative instruments by dealing only
with financially sound counterparties.  Accordingly,
the Company does not anticipate loss for non-
performance.  The Company does not enter into
derivative instruments to generate trading profits.
Refer to "Market Risk Disclosures" in Management's
Discussion and Analysis of Operations and Financial
Condition for a discussion regarding the market risk of
the Company's financial instruments.

Debt and Equity Investments

Investments, which are primarily included in other non-
current assets, consist of a time deposit, equity
securities of licensee companies and debt and equity
securities held in non-qualified trusts to fund benefit
obligations. Investments are primarily classified as
available for sale and are carried at fair value, with
unrealized gains and losses, net of tax, reported in
other comprehensive income.  Gross unrealized gains in
1999 were $59; gross unrealized losses in 1999 were not
material. Gross unrealized gains and losses in 1998 and
1997 were not material.

Interest Rate Swap Contracts

In 1991 and 1992, the Company utilized interest rate
swaps as part of its international cash management
strategy.  The notional principal of the 1991
arrangement is $650 and the notional principal of the
1992 arrangement is $950.  Both arrangements have 20-
year terms.  At December 31, 1999, the arrangements
provide for the payment of interest based upon LIBOR
and the receipt of interest based upon an annual
election of various floating rates.  As a result, the
Company remains subject to a moderate degree of market
risk through maturity of the swaps.  These interest
rate swaps are recorded at fair value, with changes in
fair value recorded in earnings.  Annual net cash flows
for payments and receipts under these interest rate
swap contracts are not material.  The net asset or
liability under these interest rate swaps is recorded
in other current assets or other accrued liabilities,
as applicable.

To hedge future variable interest receipts on a $200
time deposit purchased in 1999, the Company entered
into an interest rate swap that matures in November
2003.  Under the swap, the Company will receive 5.6
percent on a notional principal of $200 and will pay
three-month LIBOR.  The differential paid or earned on
this interest rate swap has been designated as a hedge
and is reflected as an adjustment to interest income
over the life of the swap.

COMMITMENTS

Total rent expense amounted to $65 in 1999, $58 in 1998
and $44 in 1997.  Future minimum rental commitments on
non-cancelable operating leases as of December 31,
1999, range from $31 in 2000 to $7 in 2004, with
aggregate minimum lease obligations of $20 due
thereafter.  The Company has commitments related to
future capital expenditures totaling $179 as of
December 31, 1999.

BORROWINGS

The Company has a $1 billion committed, multi-currency
unsecured revolving credit facility expiring in 2001
from a syndicate of financial institutions.  This
facility is available for general corporate purposes
and is considered as support for the Company's
commercial paper borrowings.  This line of credit does
not require compensating balances; however, a nominal
commitment fee is paid.  At December 31, 1999, $124 had
been drawn down under this facility.  In addition, the
Company's foreign subsidiaries had available $314 in
unused lines of credit from various financial
institutions at December 31, 1999.  Generally, these
foreign credit lines do not require commitment fees or
compensating balances and are cancelable at the option
of the Company or the financial institutions.

Short-term borrowings consist of commercial paper
issued in the United States, bank loans, notes payable
and amounts drawn down under the revolving credit
facility.  Commercial paper outstanding at December 31,
1999 and 1998 was $495 and $339, respectively.  The
weighted-average interest rate for short-term
borrowings at December 31, 1999 and 1998 was 6.9
percent and 5.7 percent, respectively.

The Company has a shelf registration statement on file
with the Securities and Exchange Commission covering
the issuance of up to $200 of debt securities.  The
terms of these securities will be determined at the
time of sale.  As of December 31, 1999, no debt
securities have been issued pursuant to this
registration.

FINANCING

During 1999, a subsidiary of the Company issued $200 of
equity-type securities.  The securities bear a LIBOR-
based yield that is substantially fixed through
November 28, 2003; thereafter, the Company can elect to
reset the rate annually or substantially fix the rate
for the next five years. At December 31, 1999, the rate
was 5.6 percent.  The Company can call the securities
at any time after November 30, 2004, or earlier under
certain circumstances.  The holders can put the
securities back to the Company at any time after
November 30, 2027, or earlier under certain
circumstances.  Because of the put and call features,
this obligation is included in other long-term
liabilities.

INTEREST COSTS AND INCOME



Interest costs were as follows:

                                             1999     1998     1997
                                                       
Interest cost incurred . . . . . . . .        $41      $28      $55
Less:  amount capitalized on
        construction . . . . . . . . .         12        9       15

Interest expense . . . . . . . . . . .        $29      $19      $40

Cash paid for interest, net of
  amount capitalized  . . . . .  . . .        $28      $19      $37



Interest income for 1999, 1998 and 1997 was $103, $59
and $56, respectively.  Interest income and interest
expense are included in other (income) expense, net.

SHAREHOLDERS' EQUITY

On September 22, 1998, the Board of Directors voted to
increase the number of authorized common shares from
1.2 billion to 2.4 billion and approved a 2-for-1 stock
split.  Distribution of the split shares was made on
December 2, 1998.  On April 22, 1997, the Board of
Directors voted to increase the number of authorized
common shares from 600 million to 1.2 billion and
approved a 2-for-1 stock split.  Distribution of these
split shares was made on June 3, 1997.  All per share
amounts herein have been adjusted to reflect both stock
splits.


A summary of treasury share transactions follows
(shares in millions):

                                         1999         1998         1997
                                                           
Share balance at January 1                558          282          142
  Shares issued under stock
     incentive plans                      (10)          (9)          (4)
  Purchase of treasury shares              10            3            2
  Effect of 2-for-1 stock split             -          282          142
Share balance at December 31              558          558          282



The Company has Preferred Share Purchase Rights
outstanding that are attached to, and presently only
trade with, the Company's common shares and are not
exercisable.  The rights will become exercisable only
if a person or group acquires 20 percent or more of the
Company's common stock or announces a tender offer
which, if completed, would result in ownership by a
person or group of 20 percent or more of the Company's
common stock.  Should a person or group acquire 20
percent or more of the Company's outstanding common
stock through a merger or other business combination
transaction, each right will entitle its holder (other
than such acquirer) to purchase common shares of
Schering-Plough having a market value of twice the
exercise price of the right.  The exercise price of the
rights is $100.

Following the acquisition by a person or group of
beneficial ownership of 20 percent or more but less
than 50 percent of the Company's common stock, the
Board of Directors may call for the exchange of the
rights (other than rights owned by such acquirer), in
whole or in part, at an exchange ratio of one common
share or one two-hundredth of a share of Series A
Junior Participating Preferred Stock, per right.  Also,
prior to the acquisition by a person or group of
beneficial ownership of 20 percent or more of the
Company's common stock, the rights are redeemable for
$.005 per right at the option of the Board of
Directors.  The rights will expire on July 10, 2007,
unless earlier redeemed or exchanged.  The Board of
Directors is also authorized to reduce the 20 percent
thresholds referred to above to not less than the
greater of (i) the sum of .001 percent and the largest
percentage of the outstanding shares of common stock
then known to the Company to be beneficially owned by
any person or group of affiliated or associated persons
and (ii) 10 percent, except that following the
acquisition by a person or group of beneficial
ownership of 20 percent or more of the Company's common
stock no such reduction may adversely affect the
interests of the holders of the rights.

STOCK INCENTIVE PLANS

Under the terms of the Company's 1997 Stock Incentive
Plan, 72 million of the Company's common shares may be
granted as stock options or awarded as deferred stock
units to officers and certain employees of the Company
through December 2002.  Option exercise prices equal
the market price of the common shares at their grant
dates.  Options expire not later than 10 years after
the date of grant.  Standard options granted generally
have a one-year vesting term.  Other options granted
vest 20 percent per year for five years starting five
years after the date of grant.  Deferred stock units
are payable in an equivalent number of common shares;
the shares are distributable in a single installment or
in five equal annual installments generally commencing
one year from the date of the award.



The following table summarizes stock option activity
over the past three years under the current and prior
plans (number of options in millions):


                           1999                   1998                   1997
                               Weighted-             Weighted-             Weighted-
                    Number     Average    Number     Average    Number     Average
                      Of       Exercise     of       Exercise     of       Exercise
                    Options    Price      Options    Price      Options    Price
                                                          
Outstanding at
 January 1. . . .     42      $19.31        42       $12.20        41       $ 9.57
  Granted . . . .      9       52.86        11        39.06         9        20.57
  Exercised . . .     (8)      13.96       (10)       10.47        (8)        7.76
  Canceled
  or expired. . .     (1)      32.79        (1)       30.87         -            -
Outstanding at
  December 31 . .     42      $27.34        42       $19.31        42       $12.20
Options exercisable
 at December 31 .     27      $21.16        25       $12.02        26       $ 9.28



The Company accounts for its stock compensation
arrangements using the intrinsic value method.  If the
fair value method of accounting was applied as defined
in SFAS No. 123, "Accounting for Stock-Based
Compensation," the Company's pro forma net income would
have been $2,044, $1,704 and $1,421 for 1999, 1998 and
1997, respectively. Pro forma diluted earnings per
share would have been $1.38, $1.15 and $.96 for 1999,
1998 and 1997, respectively, and pro forma basic
earnings per share would have been $1.39, $1.16 and
$.97 for 1999, 1998 and 1997, respectively.



The weighted-average fair value per option granted in
1999, 1998 and 1997 was $12.38, $9.24 and $4.60,
respectively.  The fair values were estimated using the
Black-Scholes option pricing model based on the
following assumptions:


                                            1999       1998      1997
                                                        
          Dividend yield                    2.2%       2.4%      2.6%
          Volatility                         23%        24%       20%
          Risk-free interest rate           5.1%       5.5%      6.1%
          Expected term of options (in years) 5          5         5



In 1999, 1998 and 1997, the Company awarded deferred
stock units totaling 2.4 million, 2.5 million and 3.0
million, respectively.  The expense recorded in 1999,
1998 and 1997 for deferred stock units was $61, $45 and
$32, respectively.

INVENTORIES



Year-end inventories consisted of the following:


                                                    1999    1998
                                                      
Finished products. . . . . . . . . . . . . .        $437    $483
Goods in process . . . . . . . . . . . . . .         267     174
Raw materials and supplies . . . . . . . . .         254     184

Total inventories  . . . . . . . . . . . . .        $958    $841



Inventories valued on a last-in, first-out basis
comprised approximately 31 percent and 28 percent of
total inventories at December 31, 1999 and 1998,
respectively.  The estimated replacement cost of total
inventories at December 31, 1999 and 1998 was $972 and
$864, respectively.

RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS

The Company has defined benefit pension plans covering
eligible employees in the United States and certain
foreign countries, and the Company provides post-
retirement health care benefits to its eligible U.S.
retirees and their dependents.



The components of net pension and other post-retirement
benefit (income) expense were as follows:



                                                                Post-retirement
                                                                  Health Care
                                            Retirement Plans        Benefits
                                            1999  1998  1997    1999  1998  1997
                                                              

Service cost                                 $42   $41   $37      $5    $5    $4
Interest cost                                 62    59    54      11    11    11
Expected  return  on plan assets            (101)  (89)  (81)    (18)  (17)  (15)
Amortization,  net                            (5)   (6)   (5)     (2)   (1)   (1)

Net                                          $(2)   $5    $5     $(4)  $(2)  $(1)





The components of the changes in the benefit
obligations were as follows:


                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans     Benefits
                                            1999    1998      1999    1998
                                                          
Benefit obligations at January 1. . . .     $987    $867      $177    $162
Service cost  . . . . . . . . . . . . .       42      41         5       5
Interest cost . . . . . . . . . . . . .       62      59        11      11
Assumption changes. . . . . . . . . . .     (101)     51       (20)     10
Effects of exchange rate changes. . . .       (9)      5         -       -
Benefits paid . . . . . . . . . . . . .      (41)    (62)      (11)     (8)
Actuarial (gains) and losses  . . . . .       22      22         8      (3)
Plan amendments . . . . . . . . . . . .        6       4         -       -
Benefit obligations at December 31. . .     $968    $987      $170    $177

Benefit obligations of overfunded plans     $740    $790      $170    $177
Benefit obligations of underfunded plans     228     197





The components of the changes in plan assets were as
follows:


                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans       Benefits
                                            1999    1998      1999    1998
                                                          
Fair value of plan assets, primarily
 stocks and bonds, at January 1 . . . .   $1,145  $1,039      $228    $210
Actual return on plan assets  . . . . .      188     135        42      26
Contributions . . . . . . . . . . . . .       14      13         -       -
Effects of exchange rate changes  . . .       (9)      -         -       -
Benefits paid  . . .  . . . . . . . . .      (39)    (42)      (11)     (8)
Fair value of plan assets at December 31  $1,299  $1,145      $259    $228

Plan assets of overfunded plans           $1,219  $1,086      $259    $228
Plan assets of underfunded plans              80      59



In addition to the plan assets indicated above, at
December 31, 1999 and 1998, securities of $79 and $70,
respectively, were held in non-qualified trusts
designated to provide pension benefits for certain
underfunded plans.



The following is a reconciliation of the funded status
of the plans to the Company's balance sheet at December
31:


                                                             Post-retirement
                                                               Health Care
                                         Retirement Plans        Benefits
                                          1999    1998         1999     1998
                                                             
Plan assets in excess of benefit
 obligations  . . . . . . . . . . . . .    $331    $158        $89       $51
Unrecognized net transition asset . . .     (37)    (45)         -         -
Unrecognized prior service costs. . . .      16      12         (5)       (6)
Unrecognized net actuarial (gain) . . .    (189)    (14)       (85)      (51)
Net asset (liability) . . . . . . . . .    $121    $111        $(1)      $(6)





The weighted-average assumptions employed at December
31, 1999 and 1998 were:


                                                            Post-retirement
                                                              Health Care
                                          Retirement Plans       Benefits
                                            1999    1998      1999    1998
                                                           
Discount rate                                7.0%    6.6%      7.5%    6.5%
Long-term expected rate of return on
 plan assets                                 9.5%    9.9%      9.0%    9.0%
Rate of increase in future compensation      3.9%    4.1%



The weighted-average assumed health care cost trend
rates used for post-retirement measurement purposes
were 6.6 percent for 2000, trending down to 5.0 percent
by 2002.  A 1 percent increase or decrease in the
assumed health care cost trend rate would increase or
decrease combined post-retirement service and interest
cost by $3 and the post-retirement benefit obligation
by $24.

The Company has a defined contribution profit-sharing
plan covering substantially all its full-time domestic
employees who have completed one year of service.  The
annual contribution is determined by a formula based on
the Company's income, shareholders' equity and
participants' compensation.  Profit-sharing expense
totaled $74, $66 and $58 in 1999, 1998 and 1997,
respectively.

INCOME TAXES



U.S. and foreign operations contributed to income
before income taxes as follows:


                                                  1999      1998      1997
                                                           
United States . . . . . . . . . . . . . . . .   $2,031    $1,609    $1,349
Foreign . . . . . . . . . . . . . . . . . . .      764       717       564

Total income before income taxes. . . . . . .   $2,795    $2,326    $1,913





The components of income tax expense were as follows:


                                                  1999      1998     1997
                                                            
Current:
  Federal. . . . . . . . . . . . . . . . .        $464      $442     $306
  Foreign  . . . . . . . . . . . . . . . .         185       184      160
  State. . . . . . . . . . . . . . . . . .          13        14       10

  Total current. . . . . . . . . . . . . .         662       640      476

Deferred:
  Federal and state. . . . . . . . . . . .          46       (19)      30
  Foreign. . . . . . . . . . . . . . . . .         (23)      (51)     (37)

  Total deferred . . . . . . . . . . . . .          23       (70)      (7)

Total income tax expense . . . . . . . . .        $685      $570     $469





The difference between the U.S. statutory tax rate and
the Company's effective tax rate was due to the
following:


                                                  1999    1998    1997
                                                         
U.S. statutory tax rate. . . . . . . . . .        35.0%   35.0%   35.0%
Increase (decrease) in taxes resulting
 from:
  Lower rates in other jurisdictions,
   net . . . . . . . . . . . . . . . . . .       (10.5)  (10.6)  (10.0)
  Research tax credit  . . . . . . . . . .         (.8)    (.8)    (.6)
  All other, net . . . . . . . . . . . . .          .8      .9      .1

Effective tax rate . . . . . . . . . . . .        24.5%   24.5%   24.5%



The lower rates in other jurisdictions, net, are
primarily attributable to certain employment and
capital investment actions taken by the Company.  As a
result, income from manufacturing activities in these
jurisdictions is subject to lower tax rates through
2018.

As of December 31, 1999 and 1998, the Company had total
deferred tax assets of $733 and $741, respectively, and
deferred tax liabilities of $521 and $506,
respectively.  Valuation allowances are not
significant.  Significant deferred tax assets at
December 31, 1999 and 1998 were for operating costs not
currently deductible for tax purposes and totaled $389
and $425, respectively.  Significant deferred tax
liabilities at December 31, 1999 and 1998 were for
depreciation differences, $222 and $233, respectively,
and retirement plans, $67 and $61, respectively.  Other
current assets include deferred income taxes of $507
and $521 at December 31, 1999 and 1998, respectively.

Deferred taxes are not provided on undistributed
earnings of foreign subsidiaries (considered to be
permanent investments), which at December 31, 1999,
approximated $5,020.  Determining the tax liability
that would arise if these earnings were remitted is not
practicable.

As of December 31, 1999, the U.S. Internal Revenue
Service has completed its examination of the Company's
tax returns for all years through 1988, and there are
no unresolved issues outstanding for those years.

Total income tax payments during 1999, 1998 and 1997
were $502, $458 and $368, respectively.

LEGAL AND ENVIRONMENTAL MATTERS

The Company has responsibilities for environmental
cleanup under various state, local and federal laws,
including the Comprehensive Environmental Response,
Compensation and Liability Act, commonly known as
Superfund.  At several Superfund sites (or equivalent
sites under state law), the Company is alleged to be a
potentially responsible party (PRP).  The Company
estimates its obligations for cleanup costs for
Superfund sites based on information obtained from the
federal Environmental Protection Agency, an equivalent
state agency, and/or studies prepared by independent
engineers, and on the probable costs to be paid by
other PRPs.  The Company records a liability for
environmental assessments and/or cleanup when it is
probable a loss has been incurred and the amount can
reasonably be estimated.

The Company is also involved in various other claims
and legal proceedings of a nature considered normal to
its business, including product liability cases.  The
estimated costs the Company expects to pay in these
cases are accrued when the liability is considered
probable and the amount can reasonably be estimated.
Consistent with trends in the pharmaceutical industry,
the Company is self-insured for certain events.

The recorded liabilities for the above matters at
December 31, 1999 and 1998 and the related expenses
incurred during the three years ended December 31,
1999, were not material.  Expected insurance recoveries
have not been considered in determining the costs for
environmental-related liabilities.  Management believes
that, except for the matters discussed in the following
paragraphs, it is remote that any material liability in
excess of the amounts accrued will be incurred.

The Company is a defendant in more than 110 antitrust
actions commenced (starting in 1993) in state and
federal courts by independent retail pharmacies, chain
retail pharmacies and consumers.  The plaintiffs allege
price discrimination and/or conspiracy between the
Company and other defendants to restrain trade by
jointly refusing to sell prescription drugs at
discounted prices to the plaintiffs.

One of the federal cases is a class action on behalf of
approximately two-thirds of all retail pharmacies in
the United States and alleges a price-fixing
conspiracy.  The Company agreed to settle the federal
class action for a total of $22, which has been paid in
full.  The settlement provides, among other things,
that the Company shall not refuse to grant discounts on
brand-name prescription drugs to a retailer based
solely on its status as a retailer and that, to the
extent a retailer can demonstrate its ability to affect
market share of a Company brand-name prescription drug
in the same manner as a managed care organization with
which the retailer competes, it will be entitled to
negotiate similar incentives subject to the rights,
obligations, exemptions and defenses of the Robinson-
Patman Act and other laws and regulations.  The United
States District Court in Illinois approved the
settlement of the federal class action in June 1996.
In June 1997, the Seventh Circuit Court of Appeals
dismissed all appeals from that settlement, and it is
not subject to further review.  The defendants that did
not settle the class action proceeded to trial in
September 1998.  The trial ended in November 1998 with
a directed verdict in the defendants' favor.

In April 1997, certain of the plaintiffs in the federal
class action commenced another purported class action
in United States District Court in Illinois against the
Company and the other defendants who settled the
previous federal class action.  The complaint alleges
that the defendants conspired not to implement the
settlement commitments following the settlement
discussed above.  The District Court has denied the
plaintiffs' motion for a preliminary injunction
hearing.

The Company has settled all of the state retailer
actions, except California and Alabama.  The settlement
amounts were not material to the Company.  In addition,
in June 1999, the Alabama Supreme Court reversed the
denial of a motion for judgment on the pleadings in the
Alabama retailer case.  The court held that the Alabama
antitrust law did not apply to conspiracies alleged to
be in interstate commerce.  Based on that ruling, the
Alabama retailer case has been dismissed.

The Company has settled all of the state consumer
cases, except Alabama, North Dakota, South Dakota, West
Virginia and New Mexico.  The settlement amounts were
not material to the Company.  A motion is pending to
dismiss the Alabama consumer case based on the Alabama
Supreme Court decision in the retailer case.

In May 1998, the Company settled six of the federal
antitrust cases brought by 26 food and drug chain
retailers and several independent retail stores.
Plaintiffs in these cases comprise collectively
approximately one-fifth of the prescription drug retail
market.  Also in 1999, the Company settled federal
antitrust cases brought by independent pharmacists and
small pharmacy chains comprising about 2 percent of the
prescription drug retail market.  The settlement
amounts were not material to the Company.

Plaintiffs in these antitrust actions generally seek
treble damages in an unspecified amount and an
injunction against the allegedly unlawful conduct.

The Company believes all the antitrust actions are
without merit and is defending itself vigorously.

In March 1996, the Company was notified that the United
States Federal Trade Commission (FTC) is investigating
whether the Company, along with other pharmaceutical
companies, conspired to fix prescription drug prices.
The investigation is ongoing.  The Company believes
that its actions have been lawful and proper and is
cooperating in the investigation.  However, it is not
possible to predict the outcome of the investigation,
which could result in the imposition of fines,
penalties and injunctive or administrative remedies.

In October 1999, the Company received a subpoena from
the U.S. Attorney's Office for the Eastern District of
Pennsylvania, pursuant to the Health Insurance
Portability and Accountability Act of 1996, concerning
the Company's contracts with pharmacy benefit managers
(PBMs) and managed care organizations to provide
disease management services in connection with the
marketing of its pharmaceutical products.  It appears
that the subpoena is one of a number addressed to
industry participants including PBMs, managed care
organizations and manufacturers as a part of an inquiry
into, among other things, marketing practices. The
government's inquiry appears to focus on whether the
Company's disease management and other marketing
programs comply with federal health care laws and
whether the value of its disease management programs
should have been included in the calculation of rebates
to the government.  The Company believes that its
disease management and other marketing programs have
been designed to comply with the law and that its
rebate calculations have properly excluded the value of
its disease management programs.  The Company is
cooperating in the investigation.  However, it is not
possible to predict the outcome of the investigation,
which could include the imposition of fines, penalties
and injunctive or administrative remedies.  Nor can the
Company predict whether the investigation will affect
its marketing practices or sales.

The Company is a party to an arbitration filed by
Biogen, Inc. (Biogen) in a dispute over the method used
by the Company to determine the amount of royalties
payable to Biogen on sales of REBETRON Combination
Therapy containing REBETOL Capsules and INTRON A
Injection.  The Company believes that it should prevail
in this arbitration.  However, there can be no
assurance that the Company will prevail.

In February 1998, Geneva Pharmaceuticals, Inc. (Geneva)
submitted an Abbreviated New Drug Application (ANDA) to
the U.S. Food and Drug Administration (FDA) seeking to
market a generic form of CLARITIN in the United States
several years before the expiration of the Company's
patents.  Geneva has alleged that certain of the
Company's U.S. CLARITIN patents are invalid and
unenforceable.  The CLARITIN patents are material to
the Company's business.  In March 1998, the Company
filed suit in federal court seeking a ruling that
Geneva's ANDA submission constitutes willful
infringement of the Company's patents and that its
challenge to the Company's patents is without merit.
The Company believes that it should prevail in the
suit.  However, as with any litigation, there can be no
assurance that the Company will prevail.

During 1999, Copley Pharmaceutical, Inc., Teva
Pharmaceuticals, Inc., Novex Pharma and Zenith Goldline
Pharmaceuticals individually notified the Company that
each had submitted an ANDA to the FDA seeking to market
certain generic forms of CLARITIN in the United States
before the expiration of certain of the Company's
patents, and in 2000 Andrx Pharmaceuticals, L.L.C.
(Andrx) made a similar submission relating to CLARITIN-
D 24 Hour tablets.  Each has alleged that one or more
of those patents are invalid and unenforceable.  In
each case, except Andrx, the Company has filed suit in
federal court seeking a ruling that the applicable ANDA
submission and proposed marketing of a generic product
constitute willful infringement of the Company's patent
and that the challenge to the patent is without merit.
The Company will file a similar suit against Andrx in
federal court.  The Company believes that it should
prevail in these suits.  However, as with any
litigation, there can be no assurance that the Company
will prevail.

In January 2000, Hoffman-La Roche Inc. filed actions
against the Company in United States District Court in
New Jersey and in France alleging that the Company's
PEG-INTRON (peginterferon alfa-2b) infringes Hoffman-La
Roche Inc.'s patents on certain pegylated interferons.
The Company believes that it should prevail in these
suits.  However, as with any litigation, there can be
no assurance that the Company will prevail.




QUARTERLY DATA (UNAUDITED)



Three Months Ended      March 31,        June 30,         September 30,     December 31,

                      1999    1998     1999     1998     1999      1998    1999     1998
                                                           
Net sales .  .  .  . $2,186  $1,908   $2,451   $2,124   $2,236   $1,986   $2,303   $2,059
Cost of sales.  .  .    432     380      472      423      438      394      458      404

Gross profit .  .  .  1,754   1,528    1,979    1,701    1,798    1,592    1,845    1,655

Selling, general
 and
 administrative .  .    794     712      963      828      814      762      863      839
Research and
  development   .  .    262     224      297      261      305      257      327      265
Other (income)
  expense, net  .  .    (15)     (4)      (7)       9       (7)       1      (15)      (4)

Income before
  income taxes  .  .    713     596      726      603      686      572      670      555
Income taxes    .  .    174     146      179      148      168      140      164      136

Net income.  .  .  .  $ 539   $ 450    $ 547    $ 455    $ 518    $ 432    $ 506     $419

Diluted earnings
  per common share .  $ .36   $ .30    $ .37    $ .31    $ .35    $ .29    $ .34     $.28

Basic earnings per
  common  share .  .    .37     .31      .37      .31      .35      .29      .35      .29

Dividends per
  common share  .  .    .11     .095     .125     .11      .125     .11      .125     .11

Common share prices:
  High .  .  .  .  .  58 7/8  42 3/4   60 3/4  46 11/16    56     53 17/32  56 7/8  57 1/2

  Low  .  .  .  .  .  51 1/8  30 27/32 43 5/16 39 1/16   41 9/16  43        40 3/4  45 13/16

Average shares
 outstanding for
 diluted EPS
  (in millions) .  .   1,491   1,485    1,486    1,488    1,484   1,490    1,483    1,489

Average shares
 outstanding for
 basic EPS
  (in millions) .  .   1,472   1,466    1,470    1,467    1,469   1,469    1,470    1,470




The Company's common shares are listed and principally
traded on the New York Stock Exchange.  The approximate
number of holders of record of common shares as of
December 31, 1999, was 46,000.



SEGMENT INFORMATION

Schering-Plough is a worldwide research-based
pharmaceutical company engaged in the discovery,
development, manufacturing and marketing of
pharmaceutical products.  Discovery and development
efforts target the field of human health.  However,
application in the field of animal health can result
from these efforts. The Company views animal health
applications as a means to maximize the return on
investments in discovery and development.  The Company
operates primarily in the prescription pharmaceutical
marketplace.  However, the Company historically has
sought regulatory approval to switch prescription
products to over-the-counter (OTC) status as a means of
extending a product's life cycle.  In this way, the OTC
marketplace is yet another means of maximizing the
return on investments in discovery and development.
Effective January 1, 1999, the Company changed the
structure of its internal organization to reflect this
focus on pharmaceutical research and development.  As a
result, the Company reports as one segment.
Previously, the Company was organized into two business
units: pharmaceuticals and health care. Prior year
information has been restated on this basis.



Net Sales by Major Therapeutic Category


                                1999      1998      1997
                                         
Allergy & Respiratory . . . . $3,850    $3,375    $2,708
Anti-infective & Anticancer .  1,738     1,263     1,156
Dermatologicals . . . . . . .    682       619       571
Cardiovasculars . . . . . . .    673       750       637
Other Pharmaceuticals . . . .    792       688       649
Animal Health . . . . . . . .    678       647       389
Foot Care . . . . . . . . . .    348       336       300
OTC . . . . . . . . . . . . .    221       218       220
Sun Care. . . . . . . . . . .    194       181       148
Consolidated net sales. . . . $9,176    $8,077    $6,778

Consolidated income
       before income taxes. . $2,795    $2,326    $1,913



The Company operates in more than 40 countries outside
the United States.  Sales outside the United States
comprised 36 percent, 37 percent and 39 percent of
consolidated net sales in 1999, 1998 and 1997,
respectively.  No single foreign country accounted for
more than 5 percent of consolidated net sales during
the past three years.



Net Sales by Geographic Area


                                      1999      1998      1997
                                                
United States. . . . . . . . . . . . $5,835    $5,113    $4,151

Europe and Canada. . . . . . . . . .  2,157     1,889     1,620

Latin America. . . . . . . . . . . .    614       578       453

Pacific Area and Asia. . . . . . . .    570       497       554

Consolidated net sales . . . . . . . $9,176    $8,077    $6,778



Net sales are presented in the geographic area in which
the Company's customers are located.  During 1999 and
1998, 12 percent and 11 percent, respectively, of
consolidated net sales were made to McKesson HBOC,
Inc., a major pharmaceutical and health care products
distributor.  During 1997, no single customer accounted
for more than 10 percent of consolidated net sales.



Long-lived Assets by Geographic Location


                                       1999      1998      1997
                                                
United States. . . . . . . . . . . . $1,738    $1,516    $1,348

Ireland. . . . . . . . . . . . . . .    340       338       340

Singapore. . . . . . . . . . . . . .    260       268       271

Puerto Rico. . . . . . . . . . . . .    173       160       161

Other  . . . . . . . . . . . . . . .    621       598       606

Total. . . . . . . . . . . . . . . . $3,132    $2,880    $2,726



Long-lived assets shown by geographic location are
primarily property.


REPORT BY MANAGEMENT

Management is responsible for the preparation and the
integrity of the accompanying financial statements.
These statements are prepared in accordance with
generally accepted accounting principles and require
the use of estimates and assumptions that affect the
reported amounts of assets, liabilities, sales and
expenses.  In management's opinion, the consolidated
financial statements present fairly the Company's
results of operations, financial position and cash
flows.  All financial information in this Annual Report
is consistent with the financial statements.

The Company maintains, and management relies on, a
system of internal accounting controls and related
policies and procedures that provide reasonable
assurance of the integrity and reliability of the
financial statements.  The system provides, at
appropriate cost and within the inherent limitations of
all internal control systems, that transactions are
executed in accordance with management's authorization,
are properly recorded and reported in the financial
statements and that assets are safeguarded.  The
Company's internal accounting control system provides
for careful selection and training of supervisory and
management personnel and requires appropriate
segregation of responsibilities and delegation of
authority.  In addition, the Company maintains a
corporate code of conduct for purposes of determining
possible conflicts of interest, compliance with laws
and confidentiality of proprietary information.

The Company's independent auditors, Deloitte & Touche
LLP, audit the annual consolidated financial
statements.  They evaluate the Company's internal
accounting controls and perform tests of procedures and
accounting records to enable them to express their
opinion on the fairness of these statements.  In
addition, the Company has an internal audit function
that regularly performs audits using programs designed
to test compliance with Company policies and
procedures, and to verify the adequacy of internal
accounting controls and other financial policies.  The
internal auditors' and independent auditors'
recommendations concerning the Company's system of
internal accounting controls have been considered and
appropriate action has been taken with respect to those
recommendations.

The Finance, Compliance and Audit Committee of the
Board of Directors consists solely of non-employee
directors.  The Committee meets periodically with
management, the internal auditors and the independent
auditors to review audit results, financial reporting,
internal accounting controls and other financial
matters.  Both the independent auditors and internal
auditors have full and free access to the Committee.

/S/ Richard Jay Kogan  /S/Jack L. Wyszomierski    /S/Thomas H. Kelly
    Chairman              Executive Vice President   Vice President
    of the Board and      and Chief Financial        and Controller
    Chief Executive       Officer
    Officer

INDEPENDENT AUDITORS' REPORT
DELOITTE & TOUCHE

Schering-Plough Corporation, its Directors and
Shareholders:

We have audited the accompanying consolidated balance
sheets of Schering-Plough Corporation and subsidiaries
as of December 31, 1999 and 1998, and the related
consolidated statements of income, shareholders' equity
and cash flows for each of the three years in the
period ended December 31, 1999.  These financial
statements are the responsibility of the Company's
management.  Our responsibility is to express an
opinion on these financial statements based on our
audits.

We conducted our audits in accordance with generally
accepted auditing standards.  Those standards require
that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are
free of material misstatement.  An audit includes
examining, on a test basis, evidence supporting the
amounts and disclosures in the financial statements.
An audit also includes assessing the accounting
principles used and significant estimates made by
management, as well as evaluating the overall financial
statement presentation.  We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements
present fairly, in all material respects, the financial
position of Schering-Plough Corporation and
subsidiaries at December 31, 1999 and 1998, and the
results of their operations and their cash flows for
each of the three years in the period ended December
31, 1999, in conformity with generally accepted
accounting principles.

/S/DELOITTE & TOUCHE LLP
Parsippany, New Jersey
February 11, 2000



SCHERING-PLOUGH CORPORATION AND SUBSIDIARIES

SIX-YEAR SELECTED FINANCIAL & STATISTICAL DATA
(Dollars in millions, except per share figures)


                                   1999     1998     1997     1996     1995     1994
                                                            
Operating Results
Net Sales . . . . . . . . . . .  $9,176   $8,077   $6,778   $5,656   $5,104   $4,537
Income before income taxes. . . . 2,795    2,326    1,913    1,606    1,395    1,227
Income from continuing operations 2,110    1,756    1,444    1,213    1,053      926
Discontinued operations . . . . .     -        -        -        -     (166)      (4)
Net income. . . . . . . . . . . . 2,110    1,756    1,444    1,213      887      922
Diluted earnings per common share
  from continuing operations  . .  1.42     1.18      .97      .82      .70      .60
Diluted earnings per common share  1.42     1.18      .97      .82      .59      .60
Basic earnings per common share
  from continuing operations. . .  1.44     1.20      .98      .82      .71      .61
Discontinued operations   . . . .     -        -        -        -     (.11)    (.01)
Basic earnings per common share .  1.44     1.20      .98      .82      .60      .60
Investments
Research and development. . . . .$1,191   $1,007   $  847   $  723   $  657   $  610
Capital expenditures. . . . . . .   543      389      405      336      304      286
Financial Condition
Property, net . . . . . . . . . .$2,939   $2,675   $2,526   $2,246   $2,099   $2,082
Total assets. . . . . . . . . . . 9,375    7,840    6,507    5,398    4,665    4,326
Long-term debt. . . . . . . . . .     6        4       46       46       87      186
Shareholders' equity. . . . . . . 5,165    4,002    2,821    2,060    1,623    1,574
Net book value per common share .  3.51     2.72     1.93     1.41     1.11     1.06
Financial Statistics
Income from continuing operations
 as a percent of sales. . . . . .  23.0%    21.7%    21.3%    21.4%    20.6%    20.4%
Net income as a percent of sales.  23.0%    21.7%    21.3%    21.4%    17.4%    20.3%
Return on average shareholders'
  equity. . . . . . . . . . . . .  46.0%    51.5%    59.2%    65.9%    55.5%    58.4%
Effective tax rate. . . . . . . .  24.5%    24.5%    24.5%    24.5%    24.5%    24.5%
Other Data
Cash dividends per common share .$ .485   $ .425   $ .368   $  .32   $ .281   $ .248
Cash dividends on common shares .   716      627      542      474      416      379
Depreciation and amortization . .   264      238      200      173      157      145
Number of employees . . . . . . .26,500   25,100   22,700   20,600   20,100   20,000
Average shares outstanding
  for diluted earnings per common
  share (in millions) . . . . . . 1,486    1,488    1,480    1,487    1,498    1,547
Average shares outstanding
  for basic earnings per common
  share (in millions) . . . . . . 1,470    1,468    1,464    1,471    1,479    1,530
Common shares outstanding
  at year-end (in millions) . . . 1,472    1,472    1,465    1,461    1,457    1,488