UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM 10-Q



(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
ACT OF 1934 FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1998

OR

( )  TRANSITION  REPORT  PURSUANT  TO  SECTION  13 OR  15(d)  OF THE  SECURITIES
EXCHANGE ACT OF 1934


                         Commission file number: 0-28006


                           MICROCIDE PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)


          Delaware                                        94-3186021
(State or other jurisdiction of                           (I.R.S. Employer
 incorporation of organization)                           Identification Number)

850 Maude Avenue, Mountain View, California               94043
 (Address of principal executive offices)                 (ZIP Code)

Registrant's telephone number, including area code:       650-428-1550


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

                                    Yes  X           No __

Number of shares of Common  Stock,  no par  value,  outstanding  as of April 30,
1998: 10,964,900.






                         MICROCIDE PHARMACEUTICALS, INC.

                               INDEX FOR FORM 10-Q

                                 MARCH 31, 1998


                                                                          PAGE
                                                                          NUMBER


PART I      FINANCIAL INFORMATION

Item 1.          Financial Statements and Notes

                 Condensed Balance Sheets as of March 31, 1998              3
                 and December 31, 1997

                 Condensed Statements of Operations for the three
                 months ended March 31, 1998 and March 31, 1997             4

                 Condensed Statements of Cash Flows for the three
                 months ended March 31, 1998 and March 31, 1997             5

                 Notes to Condensed Financial Statements                    6

Item 2.          Management's Discussion and Analysis of Financial
                 Condition and Results of Operations                        8


PART II     OTHER INFORMATION                                              11

Item 1.          Legal Proceedings

Item 2.          Changes in Securities

Item 3.          Defaults in Senior Securities

Item 4.          Submission of Matters to a Vote of Security Holders

Item 5.          Other Information

Item 6.          Exhibits and Reports on Form 8-K


SIGNATURES                                                                 12

                                      -2-





                                                   MICROCIDE PHARMACEUTICALS, INC.


                                                      CONDENSED BALANCE SHEETS
                                                           (in thousands)


                                                                                                     March 31,          December 31,
                                                                                                       1998                 1997
                                                                                                     --------              --------
                                                                                                    (Unaudited)             (Note)
                                                                                                                     
ASSETS

Current assets:

    Cash and cash equivalents                                                                        $  6,719              $ 11,763
    Short-term investments                                                                             30,295                28,624
    Prepaid expenses and other current assets                                                             979                 1,284
                                                                                                     --------              --------
Total current assets                                                                                   37,993                41,671

Property and equipment, net                                                                             9,385                 9,540

Other assets                                                                                              684                   571
                                                                                                     --------              --------

Total assets                                                                                         $ 48,062              $ 51,782
                                                                                                     ========              ========

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
    Accounts payable                                                                                 $    537              $  1,313
    Construction payable                                                                                   --                   347
    Accrued compensation                                                                                  874                   746
    Current portion of capital lease obligations                                                          459                   612
    Deferred revenue                                                                                      632                   786
    Other accrued liabilities                                                                             725                   632
                                                                                                     --------              --------
Total current liabilities                                                                               3,227                 4,436

Long-term portion of capital lease obligations                                                            143                   224
Accrued rent                                                                                              261                   226

Stockholders' equity:
    Common stock                                                                                       66,940                66,930
    Deferred compensation                                                                              (1,119)               (1,251)
    Net unrealized loss on securities available-for-sale                                                  (75)                  (44)
    Accumulated deficit                                                                               (21,315)              (18,739)
                                                                                                     --------              --------
Total stockholders' equity                                                                             44,431                46,896
                                                                                                     --------              --------

Total liabilities and stockholders' equity                                                           $ 48,062              $ 51,782
                                                                                                     ========              ========

NOTE:  The balance  sheet at December  31, 1997 has been  derived from the audited  financial  statements  at that date but does not
include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

<FN>
                                            See Notes to Condensed Financial Statements.
</FN>


                                                                -3-





                                                   MICROCIDE PHARMACEUTICALS, INC.


                                                 CONDENSED STATEMENTS OF OPERATIONS
                                              (in thousands, except per share amounts)
                                                             (unaudited)


                                                                                                          Three Months Ended
                                                                                                                March 31,
                                                                                                      -----------------------------
                                                                                                        1998                 1997
                                                                                                      --------             --------
                                                                                                                     
Revenues:
    License and milestone fees                                                                        $   --               $  1,000
    Research revenue                                                                                     3,035                3,107
                                                                                                      --------             --------
Total revenues                                                                                           3,035                4,107

Operating expenses:
    Research and development                                                                             5,061                4,101
    General and administrative                                                                           1,058                1,022
                                                                                                      --------             --------
Total operating expenses                                                                                 6,119                5,123
                                                                                                      --------             --------

Loss from operations                                                                                    (3,084)              (1,016)

Interest income                                                                                            526                  688
Interest and other expense                                                                                 (18)                 (53)
                                                                                                      --------             --------

Net loss                                                                                              $ (2,576)            $   (381)
                                                                                                      ========             ========


Basic and diluted net loss per share                                                                  $  (0.24)            $  (0.04)
                                                                                                      ========             ========

Shares used in calculation of basic and diluted net loss per share                                      10,929               10,760

<FN>
                                            See Notes to Condensed Financial Statements.
</FN>


                                                                -4-




                         MICROCIDE PHARMACEUTICALS, INC.


                       CONDENSED STATEMENTS OF CASH FLOWS
                Increase (decrease) in cash and cash equivalents
                                  (unaudited)


                                                            Three Months Ended
                                                                  March 31,
                                                           --------------------
                                                             1998        1997
                                                           --------    --------

Cash flows used in operating activities:
Net loss                                                   $ (2,576)   $   (381)
Adjustments to reconcile net loss to net cash
    provided by (used in) operating activities:
       Depreciation and amortization                            787         528
       Amortization of deferred compensation                    132         145
       Accrued rent                                              35          16
       Net unrealized gain (loss) on securities                 (31)         68
Changes in assets and liabilities:
    Prepaid expenses and other current assets                   305        (231)
    Other assets                                               (113)          6
    Accounts payable                                           (776)       (702)
    Construction payable                                       (347)       (698)
    Accrued compensation and other accrued liabilities          221         269
    Deferred revenue                                           (154)        610
                                                           --------    --------
Net cash provided by (used in) operating activities          (2,517)       (370)
                                                           --------    --------

Cash flows used in investing activities:
Purchase of short-term investments                          (26,746)    (39,298)
Maturities of short-term investments                         25,075      40,640
Capital expenditures                                           (632)       (683)
                                                           --------    --------
Net cash provided by (used in) investing activities          (2,303)        659
                                                           --------    --------

Cash flows from financing activities:
Principal payments on capital lease obligations                (234)       (295)
Repayment of shareholder note receivable                       --            35
Net proceeds from issuance of common stock                       10          14
                                                           --------    --------
Net cash provided by (used in) financing activities            (224)       (246)
                                                           --------    --------

Net increase (decrease) in cash and cash equivalents         (5,044)         43
Cash and cash equivalents, beginning of period               11,763       8,317
                                                           --------    --------
Cash and cash equivalents, end of period                   $  6,719    $  8,360
                                                           ========    ========

Supplemental disclosure of cash flow information:
Income taxes paid                                          $      2    $     21
                                                           ========    ========
Interest paid                                              $     18    $     42
                                                           ========    ========

                  See Notes to Condensed Financial Statements.

                                      -5-




                         MICROCIDE PHARMACEUTICALS, INC.

                     NOTES TO CONDENSED FINANCIAL STATEMENTS

                                 March 31, 1998
                                   (Unaudited)

1.  Summary of Significant Accounting Policies
     Organization and Basis of Presentation

         Microcide Pharmaceuticals,  Inc. (the "Company") is a biopharmaceutical
company  whose  mission  is  to  discover,   develop  and  commercialize   novel
antimicrobials for the improved treatment of serious bacterial, fungal and viral
infections. The Company's discovery and development programs address the growing
problem of bacterial drug  resistance  and the need for improved  antifungal and
antiviral agents through two principal themes: (i) Targeted  Antibiotics,  which
focuses on developing novel antibiotics and antibiotic  potentiators to directly
address existing  bacterial  resistance  problems,  and (ii) Targeted  Genomics,
which utilizes  bacterial,  fungal and viral genetics to discover new classes of
antimicrobials and other novel treatments for infectious diseases.

         On January 14, 1998, the Company  announced the formation and financing
of  Iconix  Pharmaceuticals,  Inc.  ("Iconix").  Iconix is a  chemical  genetics
company which will seek to develop surrogate  genetics and chemical  informatics
research into a technology  platform with broad  applicability to multiple human
diseases.  Through a private  placement,  Iconix arranged a $12.5 million equity
investment from institutional  investors.  After giving effect to the investment
and including the initial options pool reserved for employees and consultants of
Iconix,  Microcide  holds  approximately  35% of the  pro  forma  fully  diluted
outstanding  equity of Iconix.  Microcide will account for its investment  using
the equity method of accounting and since Microcide's investment has a zero book
basis, the losses of Iconix will not impact Microcide's Statement of Operations.

         The accompanying  unaudited  condensed  financial  statements have been
prepared in accordance with generally accepted accounting principles for interim
financial  information and with the  instructions to Form 10-Q and Rule 10-01 of
Regulation  S-X.  Accordingly,  they do not include all of the  information  and
footnotes  required by generally  accepted  accounting  principles  for complete
financial statements. In the opinion of management,  all adjustments (consisting
of normal recurring accruals)  considered necessary for a fair presentation have
been included.  The results of operations  for the interim  periods shown herein
are not necessarily indicative of operating results for the entire year.

         This unaudited  financial  data should be read in conjunction  with the
financial  statements and footnotes  contained in the Company's annual report on
Form 10-K for the year ended December 31, 1997.

                                      -6-




2.  Investments

         Investment securities are classified as  available-for-sale  (estimated
fair value) and consist of the following investments (in thousands):

                                                        March 31,   December 31,
                                                          1998          1997
                                                         -------      -------
Cash equivalents and short-term investments:
         Money market funds                              $   884      $ 2,133
         Corporate debt securities                        34,443       37,417
                                                         -------      -------
                                                         $35,327      $39,550
                                                         =======      =======

3. Per Share Information

         Effective December 31, 1997, the Company adopted statement of Financial
Accounting  Standards  No. 128  "Earnings  per  Share"  ("SFAS  128").  SFAS 128
requires  the  presentation  of basic  earnings  (loss)  per share  and  diluted
earnings  (loss) per share,  if more  dilutive,  for all periods  presented.  In
accordance  with SFAS 128,  basic net loss per share has been computed using the
weighted-average number of shares of Common Stock outstanding during the period.
Diluted net loss per share has not been presented;  given the Company's net loss
position, the result would be anti-dilutive.

4. Changes in Accounting Standards

         As of January 31,  1998,  the Company  adopted  Statement  of Financial
Accounting Standards No. 130 "Reporting Comprehensive Income" ("SFAS 130"). SFAS
130 established new rules for the reporting and display of comprehensive  income
and its components; however, the adoption of this Statement has no impact on the
Company's  net loss or  stockholders'  equity.  SFAS 130  requires,  among other
things, unrealized gains or losses on the Company's securities to be included in
comprehensive  income or loss.  During the three months ended March 31, 1998 and
1997,  the Company's  comprehensive  loss  amounted to $2,607,000  and $313,000,
respectively.

                                      -7-




                         MICROCIDE PHARMACEUTICALS, INC.


         Management's Discussion and Analysis of Financial Condition and
                              Results of Operations


Overview

         As  part  of  the  Company's  strategy  to  enhance  its  research  and
development  capabilities  and to  fund,  in  part,  its  capital  requirements,
Microcide   has  entered  into   collaborative   agreements   with  three  major
pharmaceutical  companies.  The  Company has  received  license  fees,  research
support  payments and milestone  payments  pursuant to these  agreements and can
potentially receive additional research support payments,  additional  milestone
payments and royalty  payments.  License  payments are  typically  nonrefundable
up-front payments for licenses to develop,  manufacture and market products,  if
any,  that are  developed  as a result of the  collaboration.  Research  support
payments are  typically  contractually  obligated  payments to fund research and
development over the term of the collaboration.  Milestone payments are payments
contingent  upon the achievement of specified  milestones,  such as selection of
candidates for drug development,  the commencement of clinical trials or receipt
of regulatory approvals.  If drugs are successfully developed and commercialized
as a result of the  collaborative  agreements,  the Company will receive royalty
payments based upon the net sales of such drugs.

         Through March 31, 1998, the Company had received in the aggregate $33.0
million in license fees,  milestone payments and research support payments under
the  collaborative  agreements.  Assuming  none  of the  existing  collaborative
agreements is terminated prior to its scheduled expiration,  the Company will be
entitled to receive an additional $18.0 million of research support payments. In
addition,  in the event that any of the  collaborative  agreements  are extended
beyond their current terms,  the Company will be entitled to receive  additional
research  support  payments.  In March 1998,  Daiichi  Pharmaceutical  Co., Ltd.
exercised its option to extend their collaborative  agreement with Microcide for
another year.

         In the event that the  Company  achieves  the  specified  research  and
product  development  milestones,  the  Company  will  be  entitled  to  receive
milestone payments under its collaborative agreements ranging from $13.0 million
to $32.5 million per product. No royalty payments have yet been received and the
Company does not expect to receive  royalties  based upon the net sales of drugs
for a significant number of years, if ever.

         Quarterly results of operations are subject to significant fluctuations
based  on  the  timing  and  amount  of  certain   revenues   earned  under  the
collaborative  agreements.  The Company expects to incur operating losses in the
future.

         This Form 10-Q contains  forward-looking  statements based upon current
expectations,  including  statements  with  regard to the  potential  receipt of
additional research support payments,  milestone payments and royalties from the
Company's  collaborative  partners,  the period of time the  Company's  existing
capital  resources and future  payments under  collaborative  agreements

                                      -8-




will  be  sufficient  to  satisfy  the  Company's  funding  requirements.   Such
forward-looking  statements  involve risk and  uncertainties,  including without
limitation,  the risk  that the  Company's  collaborations  will be  terminated,
development candidates will not be identified,  development candidates which are
selected will not proceed through pre-clinical trials or will not prove safe and
effective   for   treatment   of  humans  in  clinical   trials,   or  that  the
identification,  selection,  pre-clinical,  and clinical  testing of development
candidates will take  substantially  longer or be  substantially  more expensive
than contemplated by the Company, or that the Company will not be able to obtain
on a timely basis government regulatory clearance required for clinical testing,
manufacturing,   and  marketing  of  its  products,  and  the  other  risks  and
uncertainties set forth in the Company's annual report on Form 10-K for the year
ended  December  31,  1997.  Actual  results and timing of certain  events could
differ  materially from those indicated in the  forward-looking  statements as a
result of these or other factors.

Results of Operations

Three Months Ended March 31, 1998 and 1997

         Revenues.  Total  revenues  for the  first  quarter  of 1998  were $3.0
million,  a decrease  of  approximately  26% from the $4.1  million in  revenues
earned in the first  quarter  of 1997.  The  decline in  revenues  for the first
quarter of 1998  relative  to the first  quarter of 1997 was  largely due to the
fact that there were no license and milestone  fees in the first quarter of 1998
as compared to a $1.0 million milestone fee earned in the first quarter of 1997.

         Research and Development  Expenses.  Research and development  expenses
for the first quarter  increased  approximately 23% from $4.1 million in 1997 to
$5.1 million in 1998, primarily due to increased compensation and other expenses
related to increased headcount to support the Company's corporate collaborations
and its internal programs. Additionally, expenditures for research materials and
outside  research  contributed  to the  increase  in  research  and  development
expenses.  Research and development expenses are expected to further increase in
the  second  quarter as the  Company  adds  research  personnel  to support  its
corporate  collaborations and internal  programs,  and due to increased expenses
associated with the Company's antiviral research program with Iconix.

General and Administrative Expenses. General and administrative expenses for the
first  quarter  increased  approximately  4% from $1.0  million  in 1997 to $1.1
million  in  1998.  This  increase  in  expenses  was due  primarily  to  higher
facilities  costs  partially  offset by a  reduction  of  compensation  expenses
attributable   to  management   and   administrative   personnel.   General  and
administrative  expenses are not expected to change  significantly in the second
quarter as compared to the first quarter of 1998.

Interest  Income and Expense.  Interest  income for the first quarter  decreased
from  $688,000  in 1997 to  $526,000  in 1998,  primarily  due to a decrease  in
average cash balances in the first  quarter of 1998.  Interest and other expense
for the first quarter decreased from $53,000 in 1997 to $18,000 in 1998 due to a
decrease in capital lease balances outstanding.

Net  Loss.  The net loss for the  first  quarter  of 1998  was $2.6  million  as
compared to a net loss of $381,000 in the first quarter of 1997,  primarily as a
result of the items discussed above.

                                      -9-




Liquidity and Capital Resources

         The Company has  financed  its  operations  since  inception  primarily
through  the  sale  of  equity,   through  funds  provided  under  collaborative
agreements,  through other revenues principally consisting of sales of molecular
diversity  samples and  through  equipment  financing.  As of March 31, 1998 the
Company had received  $64.4 million from the sale of equity and $34.7 million in
cash  from  license  and  milestone  fees,   research   support  payments  under
collaborative agreements and sales of molecular diversity samples.

         Cash,  cash  equivalents  and short-term  investments at March 31, 1998
were $37.0 million  compared to $40.4 million at December 31, 1997. The decrease
during the first quarter of 1998 was due primarily to cash used by operations of
$2.5  million,  $632,000  in  capital  expenditures  and  $224,000  utilized  in
financing  activities  which  predominantly  consisted of principal  payments on
capital lease obligations.

         The Company  believes  that its existing  capital  resources,  interest
income and future  payments due under  collaborative  agreements will enable the
Company to maintain  current and planned  operations at least through 1999.

                                      -10-




PART II      OTHER INFORMATION

Item 1.      Legal Proceedings

             None.

Item 2.      Changes in Securities

             None.

Item 3.      Defaults in Senior Securities

             None.

Item 4.      Submission of Matters to a Vote of Security Holders

             None.

Item 5.      Other Information

             None.

Item 6.      Exhibits and Reports on Form 8-K

(a) The following exhibits have been filed with this report:

             27.1    Financial Data Schedule

(b) Reports on Form 8-K:

       On January 29, 1998,  the Company  filed a report on Form 8-K, as amended
       on  January  30,  1998  and  March  30,  1998,  in  connection  with  its
       collaboration  with  Iconix  Pharmaceuticals,  Inc.  (formerly  EpiGenix,
       Inc.). The Form 8-K/A filed March 30, 1998 contains financial  statements
       required by Article 11 of Reg. S-X.

                                      -11-




                                   SIGNATURES




         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


Dated:   March 14, 1998




                                              MICROCIDE PHARMACEUTICALS, INC.
                                              -------------------------------
                                              (Registrant)


                                              /s/ James E. Rurka
                                              ------------------
                                              President, Chief Executive Officer
                                              and Director (principal executive
                                              officer)




                                              /s/ Matthew J. Hogan
                                              --------------------
                                              Chief Financial Officer
                                              (principal financial and 
                                              accounting officer)

                                      -12-