THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
    SECURITIES  ACT OF 1933,  AS AMENDED OR ANY STATE  SECURITIES  LAWS AND
    NEITHER THE SECURITIES NOR ANY INTEREST  THEREIN MAY BE OFFERED,  SOLD,
    TRANSFERRED,  PLEDGED OR  OTHERWISE  DISPOSED OF EXCEPT  PURSUANT TO AN
    EFFECTIVE  REGISTRATION  STATEMENT  UNDER  SUCH ACT OR SUCH  LAWS OR AN
    EXEMPTION FROM REGISTRATION  UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE
    OPINION OF COUNSEL  FOR THE  HOLDER,  WHICH  COUNSEL  AND  OPINION  ARE
    REASONABLY SATISFACTORY TO COUNSEL FOR  THIS CORPORATION,  IS AVAILABLE.


                                 July ___, 1996


                      WARRANT TO PURCHASE SHARES OF COMMON
                       STOCK OF CHEUNG LABORATORIES, INC.

         This certifies that _____________ (the "Holder"), for a value received,
is entitled,  subject to the  adjustment and to the other terms set forth below,
to  purchase  from  Cheung  Laboratories,  Inc.,  a  Maryland  corporation  (the
"Company),  at the Stock  Purchase Price (as defined below) that number of fully
paid and nonassessable shares of the Company's $0.01 par value Common Stock (the
"Stock") as equals $________________  divided by the Stock Purchase Price, which
shall be the common stock equivalent  price of the private  placement to be sold
by the  Company in the Fall of 1996 in an  aggregate  offering  of not less than
$8,000,000 (anticipated to be at the price of $4.00 to $5.00 per share of common
stock equivalent and hereinafter  referred to as the "Private  Offering").  This
Warrant shall be  exercisable  at any time on and after six months from the date
of the next public stock offering  ("Next Public  Offering") of the Company (the
"Commencement  Date")  but not  later  than 5:00  P.M.  (New  York  Time) on the
Expiration  Date (as  defined  below),  upon  surrender  to the  Company  at its
principle office at 10220-I Old Columbia Road,  Columbia,  Maryland  21046-1705,
Attention:  Dr. Augustine  Cheung,  Chairman of the Board of Directors and Chief
Executive Officer (or at such other location as the Company may advise Holder in
writing)  of this  Warrant  properly  endorsed  with  the  form of  Subscription
Agreement  attached hereto duly filled in and signed and upon payment in cash or
cashier's  check of the aggregate  Stock Purchase Price for the number of shares
for which this Warrant is being  exercised  determined  in  accordance  with the
provisions  hereof.  The Stock Purchase Price and, in some cases,  the number of
shares purchasable  hereunder are subject to adjustment as provided in Section 3
of this  Warrant.  This  Warrant  and all  rights  hereunder,  to the extent not
exercised  in the manner set forth herein  shall  terminate  and become null and
void on the Expiration Date.  "Expiration  Date" means 5:00 P.M. (New York Time)
on the fifth anniversary of the


                                      - 1 -







Commencement  Date.  In the event that the Holder does not exercise this Warrant
pursuant  to the terms of this  Warrant,  then this  Warrant  shall  expire,  be
cancelled,  and be null  and  void.  This  Warrant  is  issued  pursuant  to the
subscription  agreement  dated the same date as this Warrant and executed by the
Holder,  for  the  Purchase  of a  secured  convertible  promissory  note in the
principal amount of $___________.

This Warrant is subject to the Following terms and conditions:

1.     Exercise: Issuance of Certificates; Payment for Shares; Conversion Right.

         1.1 Duration of Exercise of Warrant. This Warrant is exercisable at the
option of the  Holder at any time or from time to time but not  earlier  than on
the Commencement  Date or later than 5:00 P.M. (New York Time) on the Expiration
Date  for all or a  portion  of the  shares  of  Stock  which  may be  purchased
hereunder.  The  Company  agrees that the shares of Stock  purchased  under this
Warrant  shall be and are deemed to be issued to Holder as the  record  owner of
such  shares at the close of business  on the date on which this  Warrant  shall
have  been  surrendered  and  payment  made  for  such  shares.  Subject  to the
provisions  of Section  2,  certificates  for the shares of Stock so  purchased,
together with any other  securities or property to which Holder is entitled upon
such exercise, shall be delivered to Holder by the Company or its transfer agent
at the Company's  expense within a reasonable time after the rights  represented
by this Warrant have been exercised.  Each stock  certificate so delivered shall
be in such  denominations  of Stock as may be  requested  by Holder and shall be
registered  in the name of Holder or such other name as shall be  designated  by
Holder. If, upon exercise of this Warrant, fewer than all of the shares of Stock
evidenced by this Warrant are  purchased  prior to the  Expiration  Date of this
Warrant, one or more new warrants substantially in the form of, and on the terms
in, this Warrant will be issued for the remaining  number of shares of Stock not
purchased upon exercise of this Warrant.

2. Shares to Be Fully Paid:  Reservation  of Shares.  The Company  covenants and
agrees that all shares of Stock  which may be issued  upon the  exercise of this
Warrant (the "Warrant Shares") shall, upon issuance, be duly authorized, validly
issued,  fully paid and nonassessable and free from all preemptive rights of any
stockholder  and free of all  taxes,  liens,  and  charges  with  respect to the
issuance thereof. The Company believes it has sufficient shares both at the date
of this Warrant and following  the Private  Offering to provide for the exercise
of this  Warrant,  but shall take such action as may be required  following  the
Private  Offering  and the  redemption  of Stock for Mr. Gao to reserve and keep
available a sufficient number of shares of its authorized but unissued Stock for
such  exercise.  The  Company  will take all such  reasonable  actions as may be
necessary  to assure that such shares of Stock may be issued as provided  herein
without violation of any applicable law or regulation, or of any requirements of
any domestic  securities  exchange or automated  quotation system upon which the
Stock may be listed.


                                      - 2 -









3.  Adjustment of Stock Purchase Price and Number of Shares.  The Stock Purchase
Price and, in some cases, the number of shares  purchasable upon the exercise of
this  Warrant  shall  be  subject  to  adjustment  from  time to time  upon  the
occurrence of certain events described in this Section 3.

         3.1  Split or  Combination  of Stock and  Stock  Dividend:  In case the
Company  shall at any time  subdivide  its  outstanding  shares of Stock  into a
greater  number of shares or declare a dividend upon its Stock payable solely in
shares of Stock,  the Stock Purchase Price in effect  immediately  prior to such
subdivision or declaration  shall be proportionally  reduced,  and the number of
shares issuable upon exercise of the Warrant shall be proportionately increased.
Conversely,  in case the  outstanding  shares of Stock of the  Company  shall be
combined into a smaller number of shares (such as a reverse stock split, but not
to include the anticipated redemption of 20,000,000 shares of stock from Mr. Gao
pursuant  to a  Redemption  Agreement  now in  effect  with Mr.  Gao) the  Stock
Purchase  Price  in  effect  immediately  prior  to such  combination  shall  be
proportionately  increased,  and the number of shares  issuable upon exercise of
the Warrant shall be proportionately reduced.

         3.2 Dilutive  Issuances.  If prior to completion of the Company's  Next
Public  Offering,  the Company shall sell or issue at any time after the date of
this Warrant and prior to its  termination  shares of Stock (other than Excluded
Stock, as defined in Section 3.2.5) at a  consideration  per share less than the
Stock  Exercise Price in effect  immediately  prior to the time of such issue or
sale,  then,  upon such sale or  issuance,  the Stock  Purchase  Price  shall be
reduced to the lower of the prices  (calculated to the nearest cent)  determined
as follows:  by dividing  (i) the sum of (A) the total number of shares of Stock
Outstanding (as defined in Section 3.2.1) below and subject to adjustment in the
manner set forth in Section  3.1)  immediately  prior to such  issuance  or sale
multiplied by the then-existing  Stock Purchase Price, plus (B) the aggregate of
the amount of all  consideration,  if any,  received  by the  Company  upon such
issuance  or sale,  by (ii) the total  number  of  shares  of Stock  Outstanding
immediately after such issuance or sale.

                  3.2.1    Definitions.  For  purposes of this Section 3.2,  the
following definitions shall apply:

                           (a)      "Convertible   Securities"  shall  mean  any
indebtedness or equity securities convertible into or exchangeable for Stock.

                           (b)      "Options" shall mean any rights, warrants or
options to subscribe for or purchase Stock or Convertible Securities.

                           (c)      "Stock Outstanding: shall mean the aggregate
of all Stock of the Company  outstanding and all Stock issuable upon exercise of
all  outstanding   Options  and  conversion  of  all   outstanding   Convertible
Securities.

                                      - 3 -










                           (d)      "Market Price" shall mean:   (i) if there is
a ready public market of registered  stock, the Market Price shall be the "Stock
Price" (as defined in this Section 3.2.1)  obtained by taking the average over a
period of 30 days  consecutive  trading  days  ending on the second  trading day
prior to the date of determination; and (ii) if there is no ready public market,
Market price shall be the highest of the last bona fide sale made by the Company
and the fair market value of the Stock as  determined  by the Board of Directors
in its good faith judgment.

                           (e)      "Stock  Price"  shall  mean (i) the mean, on
each such trading day,  between the high and low sale price of a share of Stock,
or if no such sale takes place on any such  trading day, the mean of the highest
closing bid and lowest closing asked prices therefor on any such trading day, in
each case as officially reported on all national  securities  exchanges on which
the Stock is then listed or  admitted  to  trading,  or (ii) if the Stock is not
then listed or  admitted to trading on any  national  securities  exchange,  the
closing  price of the  Stock on such  date,  or  (iii)  if no  closing  price is
available on any such trading date, the mean between the highest closing bid and
the lowest  closing  asked  prices  thereof  on any such  trading  date,  in the
over-the-counter  market as reported by The National  Association  of Securities
Dealers  Automated  Quotation System, or (iv) if the Stock is not then quoted in
such system,  the mean between the highest  closing bid and lowest closing asked
prices  reported by market  makers and dealers for the Stock listed as such with
the  National   Quotation  Bureau,   Incorporated,   or  any  similar  successor
organization,  or (v) it there is no ready public  market,  then the Stock Price
shall be the Market Price.

                  3.2.2 For the  purposes of this  Section  3.2,  the  following
provisions shall also be applicable:

                           3.2.2.1  Cash  Consideration.  In  the  case  of  the
issuance or sale of additional Stock for cash, the consideration received by the
Company  therefor  shall be deemed  to be the  amount  of cash  received  by the
Company  for such  shares  (or,  if such  shares are  offered by the Company for
subscription,   the  subscription   price,  or,  if  such  shares  are  sold  to
underwriters or dealers for public offering without a subscription offering, the
public offering price), without deducting therefrom any compensation or discount
paid or allowed to underwriters or dealers or others performing similar services
or for any expenses incurred in connection therewith.

                           3.2.2.2   Non-Cash Consideration.   In  case  of  the
issuance (other than upon  conversion or exchange of Convertible  Securities) or
sale of additional Stock, Options or Convertible  Securities for a consideration
other than cash or a consideration a part of which shall be other than cash, the
fair market value of such  consideration as determined by the Board of Directors
of the Company in the good faith exercise of its business judgment, irrespective
of the  accounting  treatment  thereof,  shall be  deemed to be the  value,  for
purposes of this Section 3, of the consideration other than cash received by the
Company for such securities.

                                      - 4 -











                           3.2.2.3   Options and Convertible Securities. In case
the Company  shall in any manner  issue or grant any Options or any  Convertible
Securities,  the total  maximum  number of  shares  of Stock  issuable  upon the
exercise of such  Options or upon  conversion  or exchange of the total  maximum
amount of such Convertible  Securities at the time such  Convertible  Securities
first become convertible or exchangeable shall (as of the date of issue or grant
of such Options or, in the case of the issue or sale of  Convertible  Securities
other than where the same are issuable  upon the exercise of Options,  as of the
date of such issue or sale) be deemed to be issued and to be outstanding for the
purpose of this  Section  3.2 and to have been  issued for the sum of the amount
(if any) paid for such  Options or  Convertible  Securities  plus the amount (if
any) payable upon the exercise of such Options or upon conversion or exchange of
such Convertible Securities at the time such Convertible Securities first become
convertible or exchangeable; provided that, subject to the provisions of Section
3.2.3, no further  adjustment of the Stock Purchase Price shall be made upon the
actual  issuance  of any  such  Stock  or  Convertible  Securities  or upon  the
conversion or exchange of any such Convertible Securities.

                  3.2.3 Change in Option Price or Conversion.  In the event that
the purchase price provided for in any Option referred to in subsection 3.2.2.3,
or the  rate at which  any  Convertible  Securities  referred  to in  subsection
3.2.2.3 are convertible into or exchangeable for shares of Stock shall change at
any time or any additional consideration shall be payable in connection with the
exercise of any Option or the conversion or exchange of any Convertible Security
(other  than  under or by reason  of  provisions  designed  to  protect  against
dilution upon the occurrence of events of the type described in this Section 3),
then, for purposes of any adjustment required by Section 3.2, the Stock Purchase
Price in effect at the time of such event shall  forthwith be  readjusted to the
Stock  Purchase  Price  that  would  have  been in  effect at such time had such
Options or Convertible  Securities still  outstanding  provided for such changed
purchase price, conversion rate or additional consideration, as the case may be,
at  the  time  initially  granted,   issued  or  sold,  provided  that  if  such
readjustment is an increase in the Stock Purchase Price, such readjustment shall
not exceed the amount (as  adjusted by Sections  3.2 and 3.2) by which the Stock
Purchase  Price was  decreased  pursuant to Section 3.2 upon the issuance of the
Option or Convertible Security.

                  3.2.4 Termination of Option or Conversion Rights. In the event
of the termination or expiration of any right to purchase Stock under any Option
granted  after the date of this  Warrant or of any right to convert or  exchange
Convertible Securities issued after the date of this Warrant, the Stock Purchase
Price shall, upon such termination, be readjusted after the Stock Purchase Price
that would have been in effect at the time of such expiration or termination had
such Option or Convertible Security, to the extent outstanding immediately prior
to such expiration or termination, never been issued, and the shares of

                                      - 5 -









Stock issuable  thereunder  shall not longer be deemed to be Stock  Outstanding,
provided that if such  readjustment  is an increase in the Stock Purchase Price,
such  readjustment  shall not exceed the amount (as adjusted by Sections 3.1 and
3.2) by which the Stock  Purchase  Price was  decreased  pursuant to Section 3.2
upon the issuance of the Option or  Convertible  Security.  The  termination  or
expiration of any right to purchase  Stock under any Option granted prior to the
date  of this  Warrant  or of any  right  to  convert  or  exchange  Convertible
Securities  issued  prior to the date of this  Warrant  shall  not  trigger  any
adjustment to the Stock Purchase  Price,  but the shares of Stock issuable under
such  Options  or  Convertible   Securities  shall  not  longer  be  counted  in
determining the number of shares of Stock Outstanding on the date of issuance of
this Warrant for purposes of subsequent calculations under this Section 3.2

                  3.2.5 Excluded Stock.  Notwithstanding  anything herein to the
contrary,  the Stock  Purchase  Price  shall not be  adjusted  pursuant  to this
Section 3.2 by virtue of the issuance and/or sale of Excluded Stock, which shall
mean the following: (a) Stock, Options or Convertible Securities representing up
to  2,000,000  shares  of Stock  (or such  greater  number of shares of Stock as
authorized  by the Board of Directors) in the aggregate to be issued and/or sold
to employees, advisors, directors or officers of, or consultants to, the Company
or any of its  subsidiaries  pursuant  to a  stock  grant,  stock  option  plan,
restricted stock agreements, stock purchase plan, pension or profit sharing plan
or other stock  agreement  or  arrangement  approved by the  Company's  Board of
Directors,  (b) the  issuance  of shares of Stock,  Options  and/or  Convertible
Securities pursuant to Options and/or Convertible  Securities  outstanding as of
the date of this  Warrant;  (c) issuance of shares of Stock  and/or  Convertible
Securities to the Placement Agent in respect of the  transaction  represented by
the subscription  agreement related to the issuance of this Warrant; and (d) the
issuance  of shares of  Stock,  Options  or  Convertible  Securities  as a stock
dividend  or upon any split or  combination  of  shares of Stock or  Convertible
Securities.  For all purposes of this Section 3.2, all shares of Excluded  Stock
shall be deemed to have been  issued  for an amount of  consideration  per share
equal to the initial Stock  Purchase  Price (subject to adjustment in the manner
set forth in Section 3.1).

         3.3  Notice  of  Adjustment.  Promptly  after  adjustment  of the Stock
Purchase  Price or any increase or decrease in the number of shares  purchasable
upon the  exercise  of this  Warrant,  the  Company  shall give  written  notice
thereof,  by  first-class  mail,  postage  prepaid,  addressed to the registered
Holder of this  Warrant at the  address of such  Holder as shown on the books of
the  Company.  The notice  shall be signed by the  Company's  President or Chief
Executive  Officer and shall state the effective  date of the adjustment and the
Stock  Purchase  Price  resulting  from  such  adjustment  and the  increase  or
decrease,  if any,  in the number of shares  purchasable  at such price upon the
exercise  of this  Warrant,  setting  forth in  reasonable  detail the method of
calculation and the facts upon which such calculation is based.

         3.4      Notices.  If at any time:

                                      - 6 -










(a)      the Company shall declare any cash dividend upon its Stock;

(b) the Company  shall  declare  any  dividend  upon its Stock  payable in stock
(other  than a dividend  payable  solely in shares of Stock) or make any special
dividend or other distribution to the Holder of its Stock;

(c)      there  shall be any consolidation or merger of the Company with another
corporation,  or a sale of all or  substantially  all of the Company's assets to
another corporation; or

(d)      there shall be a voluntary or involuntary  dissolution,  liquidation or
winding-up of the Company

then, in any one or more of said cases,  the Company shall give, by certified or
registered  mail,  postage prepaid,  addressed to the registered  Holder of this
Warrant at the address of such Holder as shown on the books of the Company,  (i)
at least 30 days  prior  written  notice  of the date on which  the books of the
Company shall close or a record shall be taken for such  dividend,  distribution
or subscription  rights or for determining rights to vote in respect of any such
dissolution,  liquidation  or  winding-up;  (ii) at least 10 days prior  written
notice  of the date on which the books of the  Company  shall  close or a record
shall  be  taken  for  determining  rights  to  vote  in  respect  of  any  such
reorganization,  reclassification,  consolidation,  merger or sale, and (iii) in
the case of any such reorganization,  reclassification,  consolidation,  merger,
sale, dissolution, liquidation or winding-up, at least 30 days written notice of
the date when the same shall take place.  Any notice  given in  accordance  with
clause  (i)  above  shall  also  specify,  in the  case  of any  such  dividend,
distribution  or option  rights,  the date on which the Holder of Stock shall be
entitled  thereto.  Any notice given in accordance with clause (iii) above shall
also  specify  the date on which the  Holder(s)  of Stock  shall be  entitled to
exchange  their Stock for  securities or other  property  deliverable  upon such
reorganization,  reclassification,  consolidation,  merger,  sale,  dissolution,
liquidation or winding-up, as the case may be. If the Holder of the Warrant does
not exercise this Warrant prior to the occurrence of an event  described  above,
except as provided in Sections  3.1 and 3.5, the Holder shall not be entitled to
receive the  benefits  accruing to existing  holders of the Stock in such event.
Notwithstanding anything herein to the contrary, if and to the extent the Holder
chooses to exercise this Warrant within the 10- day period following  receipt of
the  notice  specified  in clause  (ii)  above,  the Holder may elect to pay the
aggregate  Stock Purchase Price by delivering to the Company cash or a cashier's
check in the  amount of the  aggregate  par  value of the  shares of Stock to be
purchased and the Holder's full  recourse  Promissory  Note in the amount of the
balance of the aggregate  Stock Purchase  Price,  which Note shall be payable to
the order of the Company in a single sum on the 30th day  following  the date of
receipt of such notice and shall bear interest at the lowest applicable  federal
short-term rate (using monthly  compounding) as established  pursuant to Section
1274(d) of the  Internal  Revenue  Code of 1986,  as amended,  or any  successor
provision;  provided,  however,  that  if  the  Holder  elects to deliver such a

                                      - 7 -









Promissory Note to the Company,  the Holder will pledge to the Company all Stock
issued in connection  with the exercise of this  Warrant,  and the Company shall
retain possession of the certificates  evidencing such Stock, until such time as
the Note is paid in full.

         3.5 Changes in Stock.  In case at any time  following the  Commencement
Date hereof, the Company shall be a party to any transaction (including, without
limitation,  a merger,  consolidation,  sale of all or substantially  all of the
Company's  assets or  recapitalization  of the  Stock)  in which the  previously
outstanding Stock shall be changed into or exchanged for different securities of
the  Company  or common  stock or other  securities  of another  corporation  or
interests in a  noncorporate  entity or other property  (including  cash) or any
combination of any of the foregoing (each such  transaction  being herein called
the  "Transaction"  and the date of consummation of the Transaction being herein
called the "Consummation  Date"), then as a condition of the consummation of the
Transaction,  lawful and adequate  provisions shall be made so that each Holder,
upon the exercise hereof on or before the  Consummation  Date, shall be entitled
to receive, and this Warrant shall thereafter represent the right to receive, in
lieu of the Stock  issuable upon such exercise prior to the  Consummation  Date,
the highest  amount of securities  or other  property to which such Holder would
actually  have been  entitled  as a  stockholder  upon the  consummation  of the
Transaction if such Holder had exercised such Warrant immediately prior thereto.
The  provisions  of  this  Section  3.5  shall  similarly  apply  to  successive
Transactions.

         3.6      Termination of Dilutive Protection.  Immediately following the
Next Public Offering all antidilution  provisions of this Section 3 shall become
null, void and of no further force or effect.

4. Issue Tax. The issuance of certificates for shares of Stock upon the exercise
of the Warrant shall be made without charge to the Holder of the Warrant for any
issue tax in respect thereof,  provided,  however, that the Company shall not be
required to pay any tax which may be payable in respect of any transfer involved
in the issuance and  delivery of any  certificates  in a name other than that of
the then Holder of the Warrant being exercised.

5. No Voting or Dividend Rights;  Limitation of Liability.  Nothing contained in
this Warrant shall be construed as  conferring  upon the Holder hereof the right
to vote or to  consent  or to  receive  notice as a  stockholder  in  respect of
meetings of  stockholders  for the  election of  directors of the Company or any
other matters or any rights  whatsoever as a stockholder of the Company.  Except
for the  adjustment to the Stock  Purchase  Price pursuant to Section 3.1 in the
event of a dividend on the Stock  payable in shares of Stock,  no  dividends  or
interest  shall be payable or accrued in respect of this Warrant or the interest
represented  hereby or the shares  purchasable  hereunder until, and only to the
extent that, this Warrant shall have been exercised.  No provisions  hereof,  in
the absence of affirmative action by the Holder to purchase shares of Stock, and
no mere  enumeration  herein of the rights or privileges  of the Holder  hereof,
shall give rise to any liability of such Holder for

                                      - 8 -









the  Stock  Purchase  Price or as a  stockholder  of the  Company  whether  such
liability is asserted by the Company or by its creditors.

6.       Restrictions  on  Transferability  of  Securities;     Compliance  with
Securities Act.

         6.1  Restrictions  on  Transferability.  This  Warrant  and the Warrant
Shares  (the  "Securities")   shall  not  be  transferable  in  the  absence  of
Registration  under the Act (as defined below) or an exemption  therefrom  under
said Act.

         6.2 Restrictive Legend. Each certificate representing the Securities or
any other  securities  issued in respect of the Securities upon any stock split,
stock dividend, recapitalization,  merger, consolidation or similar event, shall
be stamped or otherwise  imprinted with a legend  substantially in the following
form (in  addition to any legend  required  under  applicable  state  securities
laws):

    THE SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN REGISTERED  UNDER THE
    SECURITIES ACT OF 1933, AS AMENDED,  OR ANY STATE  SECURITIES  LAWS AND
    NEITHER THE SECURITIES NOR ANY INTEREST  THEREIN MAY BE OFFERED,  SOLD,
    TRANSFERRED,  PLEDGED OR  OTHERWISE  DISPOSED OF EXCEPT  PURSUANT TO AN
    EFFECTIVE  REGISTRATION  STATEMENT  UNDER  SUCH ACT OR SUCH  LAWS OR AN
    EXEMPTION FROM REGISTRATION  UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE
    OPINION OF COUNSEL  FOR THE  HOLDER,  WHICH  COUNSEL  AND  OPINION  ARE
    REASONABLY SATISFACTORY TO COUNSEL FOR THIS COMPANY, IS AVAILABLE.

7.       Registration Rights.  The  Common  Stock  underlying  this  Warrant  is
subject to a Registration  Rights Agreement  entered into by Holder of even date
herewith and which is  incorporated  herein by reference and attached  hereto as
Exhibit A.

8.       Modification and Waiver.   This Warrant and any provision hereof may be
changed,  waived,  discharged  or  terminated  only by an  instrument in writing
signed by the party against which enforcement of the same is sought,

9. Notices.  Any notice,  request or other document  required or permitted to be
given or  delivered  to the Holder  hereof or the Company  shall be delivered or
shall be sent by certified or registered  mail,  postage  prepaid,  to each such
Holder at its  address as shown on the books of the Company or to the Company at
the address indicated therefor in the first paragraph of this Warrant.

10.      Description Headings and Governing Law. The descriptive headings of the
several  sections and  paragraphs  of this Warrant are inserted for  convenience
only  and do not  constitute  a part of this  Warrant.  This  Warrant  shall  be
construed and enforced in accordance  with,  and the rights of the parties shall
be governed by, the internal laws of the State of Maryland.

                                      - 9 -











11. Lost Warrants or Stock Certificates.  The Company represents and warrants to
Holder the upon receipt of evidence  reasonably  satisfactory  to the Company of
the loss,  theft,  destruction or mutilation of any Warrant or stock certificate
and, in the case of any such loss, theft or destruction,  and if requested, upon
receipt of an indemnity bond reasonably  satisfactory to the Company,  or in the
case of any such mutilation,  upon surrender and cancellation of such Warrant or
stock  certificate,  the  Company  at its  expense  will make and  deliver a new
Warrant  or stock  certificate,  of like  tenor,  in lieu of the  lost,  stolen,
destroyed or mutilated Warrant or stock certificate.

12.  Fractional  Shares.  No fractional  shares shall be issued upon exercise of
this Warrant. The Company shall, in lieu of issuing any fractional share pay the
Holder entitled to such fraction a sum in cash equal to the fair market value of
any such  fractional  interest as it shall  appear on the public  market,  or if
there  is no  public  market  for  such  shares,  then as  shall  be  reasonably
determined by the Company.

IN WITNESS  WHEREOF,  the Company has caused this  Warrant to be executed by its
officer, thereunto duly authorized as of this ____ day of July, 1996.

         CHEUNG LABORATORIES, INC.



By:      ___________________________
         Signature

By:      ___________________________
         Print Name

Title:   ___________________________

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                         FORM OF SUBSCRIPTION AGREEMENT

              (To be signed and delivered upon exercise of Warrant)

[DATE]

Attention:  _______________
Cheung Laboratories, Inc.
10220-I Old Columbia Road
Columbia, Maryland  21046-1705

Dear __________:

         The undersigned,  the Holder of the within Warrant,  hereby irrevocably
elects to exercise the purchase  rights  represented by such Warrant for, and to
purchase  thereunder,  _______ shares of Common Stock, par value $0.01 per share
(the "Common Stock") of Cheung Laboratories, Inc. (the "Company") and subject to
the  following  paragraph,  herewith  makes payment of  _______________  Dollars
($________)  therefor  and  requests  that the  certificates  for such shares be
issued in the name of, and delivered to, _________________________________ whose
address is

                                                        .

         If the  shares  issuable  upon the  exercise  of this  Warrant  are not
covered by a registration  statement effective under the Securities Act of 1933,
as amended,  (the "Securities  Act"), the undersigned  represents as of the date
hereof that:

                  (i)  the  undersigned  is  acquiring  such  Common  Stock  for
investment for his own account,  not as nominee or agent, and not with a view to
the  distribution  thereof  and the  undersigned  has not  signed  or  otherwise
arranged  for  the  selling,   granting  any   participation  in,  or  otherwise
distributing the same,

                  (ii) the  undersigned  has such  knowledge  and  experience in
financial  and business  matters as to be capable of  evaluating  the merits and
risks of the undersigned's investment in the Common Stock,

                  (iii) the  undersigned has received all of the information the
undersigned   has  requested  from  the  Company  and  considers   necessary  or
appropriate for deciding whether to purchase the shares of Common Stock,

                  (iv) the undersigned has the ability to bear the economic risk
of his prospective investment,

                                      - 1 -










                  (v) the undersigned is able, without materially  impairing his
financial condition, to hold the shares of Common Stock for an indefinite period
of time and to suffer complete loss on his investment,

                  (vi) the undersigned understands and agrees that (A) he may be
unable to readily  liquidate  his  investment  in the shares of Common Stock and
that  the  shares  must be held  indefinitely  unless a  subsequent  disposition
thereof is registered or qualified under the Securities Act and applicable state
securities   or  Blue  Sky  laws  or  is  exempt  from  such   registration   or
qualification,  and that the Company is not  required to register the same or to
take any  action  or make  such an  exemption  available  except  to the  extent
provided in the within Warrant,  and (B) the exemption from  registration  under
the  Securities  Act  afforded by Rule 144  promulgated  by the  Securities  and
Exchange  Commission  ("Rule  144")  depends  upon the  satisfaction  of various
conditions by the undersigned and the Company and that, if applicable,  Rule 144
affords the basis for sales under certain  circumstances in limited amounts, and
that if such exemption is utilized by the  undersigned,  such conditions must be
fully complied with by the undersigned and the Company, as required by Rule 144,

                  (vii) the  undersigned  is (A) familiar with the definition of
and the undersigned is an "accredited  investor" within the meaning of such term
under Rule 501 of Regulation D promulgated  under the Securities  Act, or (B) is
providing  representations and warranties reasonably satisfactory to the Company
and its  counsel,  to the effect that the sale and issuance of Common Stock upon
exercise of such Warrant may be made without  registration  under the Securities
Act or any applicable state securities and Blue Sky laws, and

                  (viii) the  address  set  forth  below is the true and correct
address of the undersigned's residence.

Dated:  ________________


________________________
Signature

Signature must conform in all respects to the name of Holder as specified on the
face of the Warrant)


Address:  _______________________

          _______________________

          _______________________                                 

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