<PAGE>   1


  As filed with the Securities and Exchange Commission on November 15, 1995

                                              Registration No. 33-
- -------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                     under
                           THE SECURITIES ACT OF 1933

                               MERCK & CO., INC.
               (Exact name of issuer as specified in its charter)

                                 P.O. BOX 1000
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
                    (Address of Principal Executive Offices)

NEW JERSEY                                                           22-1109110
(State of Incorporation)                   (I.R.S. Employer Identification No.)

                           1996 INCENTIVE STOCK PLAN
                    NON-EMPLOYEE DIRECTORS STOCK OPTION PLAN
             MERCK EMPLOYEES FEDERAL CREDIT UNION STOCK OPTION PLAN

                           (Full title of the plans)

                                CELIA A. COLBERT
                    Secretary and Assistant General Counsel
                               MERCK & CO., INC.
                                  P.O. Box 100
                   Whitehouse Station, New Jersey 08889-0100
                                 (908) 423-1000
           (Name, address and telephone number of agent for service)

 If any of the securities being registered on this Form are to be offered on a
  delayed or continuous basis pursuant to Rule 415 under the Securities Act of
    1933, other than securities offered only in connection with dividend or
            interest reinvestment plans, check the following box./x/

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
============================================================================================================
     Title of Securities                 Amount              Proposed            Proposed        Amount of
      to be registered                    to be               maximum            maximum        registration
                                       registered         offering price        aggregate           fee
                                                            per share*       offering price*
- ------------------------------------------------------------------------------------------------------------
<S>                                 <C>
Common Stock (no Par Value)..       65,232,500 shares       $58.0625          $3,787,562,031     $757,512.41
============================================================================================================
</TABLE>

*  The prices stated above are estimated solely for the purpose of determining
the registration fee and are based on the average of the high and low market
prices of the stock as reported on the composite tape of New York Stock Exchange
listed issues on November 8, 1995.

- -------------------------------------------------------------------------------

<PAGE>   2

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

         The following documents filed by the registrant (Exchange Act File No.
1-3305) with the Securities and Exchange Commission are incorporated herein by
reference and made a part hereof:

(a)  Annual Report on Form 10-K, dated March 22, 1995 for the fiscal year ended
     December 31, 1994;

(b)  Form 10-K/A filed on June 29, 1995, amending Merck's Annual Report on Form
     10-K for the fiscal year ended December 31, 1994.

(c)  Quarterly Report on Form 10-Q filed on May 11, 1995 for the quarter ended
     March 31, 1995;

(d)  Quarterly Report on Form 10-Q filed on August 10, 1995 for the quarter
     ended June 30, 1995;

(e)  Quarterly Report on Form 10-Q filed on November 13, 1995 for the quarter
     ended September 30, 1995;

(f)  Current Report on Form 8-K filed on July 19, 1995;



                                       2

<PAGE>   3

(g)  Current Report on Form 8-K filed on October 4, 1995;

(h)  Proxy Statement for the Annual Meeting of Stockholders held on April 25,
     1995;

(i)  The descriptions of the Common Stock of the registrant set forth in the
     registrant's Registration Statements pursuant to Section 12 of the Exchange
     Act, and any amendment or report filed for the purpose of updating such
     description.

         All documents filed by the registrant pursuant to Section 13, 14 or
15(d) of the Exchange Act from the date hereof and prior to the termination of
the offering of the securities offered hereby shall be deemed to be incorporated
by reference herein and to be a part hereof from the date of filing of such
documents. An Exhibit Index can be found on page 13 of this Registration
Statement.


ITEM 4.  DESCRIPTION OF SECURITIES

         Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

         The validity of the Common Stock will be passed upon for the Company by
Mary M. McDonald, Senior Vice President and General Counsel of the Company. Ms.
McDonald is eligible to participate in the Plans and does participate.



                                       3

<PAGE>   4

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The New Jersey Business Corporation Act provides that a New Jersey
corporation has the power to indemnify a director or officer against his or her
expenses and liabilities in connection with any proceeding involving the
director or officer by reason of his or her being or having been such a director
or officer, other than a proceeding by or in the right of the corporation, if
such a director or officer acted in good faith and in a manner he or she
reasonably believed to be in or not opposed to the best interests of the
corporation; and with respect to any criminal proceeding, such director or
officer had no reasonable cause to believe his or her conduct was unlawful.

         The indemnification and advancement of expenses shall not exclude any
other rights, including the right to be indemnified against liabilities and
expenses incurred in proceedings by or in the right of the corporation, to which
a director or officer may be entitled under a certificate of incorporation,
bylaw, agreement, vote of shareholders, or otherwise; provided that no
indemnification shall be made to or on behalf of a director or officer if a
judgment or other final adjudication adverse to the director or officer
establishes that his or her acts or omissions (a) were in breach of his or her
duty of loyalty to the corporation or its shareholders, (b) were not in good
faith or involved in a knowing violation of law or (c) resulted in receipt by
the director or officer of an improper personal benefit.


                                        4

<PAGE>   5

         The Company's Restated Certificate of Incorporation provides that, to
the fullest extent permitted by the laws of the State of New Jersey, directors
and officers of the Company shall not be personally liable to the Company or its
stockholders for damages for breach of any duty owed to the Company or its
stockholders, except that a director or officer shall not be relieved from
liability for any breach of duty based upon an act or omission (a) in breach of
such person's duty of loyalty to the Company or its stockholders, (b) not in
good faith or involving a knowing violation of law or (c) resulting in receipt
by such person of an improper personal benefit.

         The By-Laws of the Company provide that a former, present or future
director, officer or employee of the Company or the legal representative of any
such director, officer or employee shall be indemnified by the Company:

                 (a) against reasonable costs, disbursements and counsel fees
         paid or incurred where such person has been successful in the defense
         on the merits or otherwise of any pending, threatened or completed
         civil, criminal, administrative or arbitrative action, suit or
         proceeding, brought by reason of such person's being or having been
         such director, officer or employee, and

                 (b) with respect to the defense of any such action, suit,
         proceeding, inquiry or investigation for which indemnification is not
         made under (a) above, against reasonable costs, disbursements (which
         shall include amounts paid in satisfaction of settlements, judgments,
         fines and penalties, exclusive, however, of any amount paid or payable
         to the



                                        5

<PAGE>   6

         Company) and counsel fees if such person acted in good faith and in a
         manner such person reasonably believed to be in or not opposed to the
         best interests of the Company, and in connection with any criminal
         proceedings such person also had no reasonable cause to believe the
         conduct was unlawful, with the determination as to whether the
         applicable standard of conduct was met to be made by a majority of the
         members of the Board of Directors (sitting as a Committee of the Board)
         who were not parties to such inquiry, investigation, action, suit or
         proceeding or by any one or more disinterested counsel to whom the
         question may be referred by the Board of Directors; provided, however,
         in connection with any proceeding by or in the right of the Company, no
         indemnification shall be provided as to any person adjudged by any
         court to be liable to the Company except as and to the extent
         determined by such court.

         The Company enters into indemnification agreements with its directors
and officers and enters into insurance agreements on its own behalf. The
indemnification agreements provide that the Company agrees to hold harmless and
indemnify its directors and officers to the fullest extent authorized or
permitted by the Business Corporation Act of the State of New Jersey, or any
other applicable law, or by any amendment thereof or other statutory provisions
authorizing or permitting such indemnification that is adopted after the date
hereof. Without limiting the generality of the foregoing, the Company agrees to
hold harmless and indemnify its directors and officers to the fullest extent
permitted by applicable law against any and all expenses, judgments, fines, and
amounts paid in settlement actually and reasonably incurred by its directors and
officers in connection with the defense of any present or future threatened,
pending, or completed claim,



                                        6

<PAGE>   7

action, suit, or proceeding by reason of the fact that they were, are, shall be,
or shall have been a director or officer of the Company, or are or were serving,
shall serve, or shall have served, at the request of the Company, as director or
officer of another corporation, partnership, joint venture, trust, employee
benefit plan, or other enterprise.


ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

         Not applicable.


ITEM 8.  EXHIBITS

<TABLE>
<CAPTION>
Exhibit        Description                                            Method of Filing
Number         -----------                                            ----------------
- ------
<S>            <C>                                                    <C>
4(a)           --Restated Certificate of Incorporation of the         Incorporated by reference to Form 10-K
               registrant (May 6, 1992)                               Annual Report for the fiscal year ended
                                                                      December 31, 1992

4(b)           --By-Laws of the registrant (as amended effective      Incorporated by reference to Form 10-K
               June 9, 1994)                                          Annual Report for the fiscal year ended
                                                                      December 31, 1994

5              --Opinion and Consent of Mary M. McDonald,             Filed with this Registration Statement
               General Counsel of registrant

23             --Consent of Arthur Andersen LLP                       Included at Page 12 of this Registration
                                                                      Statement

24             -- Certified Resolution of Board of Directors and      Filed with this Registration Statement
               Power of Attorney
</TABLE>


                                        7

<PAGE>   8

ITEM 9.  UNDERTAKINGS

         The undersigned registrant hereby undertakes:

1. (a)   To file, during any period in which offers or sales are being made, a
         post-effective amendment to the registration statement to include any
         material information with respect to the plan of distribution not
         previously disclosed in the registration statement or any material
         change to such information in the registration statement.

   (b)   That, for the purpose of determining any liability under the Securities
         Act of 1933, each such post-effective amendment shall be deemed to be a
         new registration statement relating to the securities offered therein,
         and the offering of such securities at that time shall be deemed to be
         the initial bona fide offering thereof.

   (c)   To remove from registration by means of a post-effective amendment any
         of the securities being registered which remain unsold at the
         termination of the offering.

2.       That, for purposes of determining any liability under the Securities
         Act of 1933, each filing of the registrant's annual report pursuant to
         Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (and,
         where applicable, each filing of an employee benefit plan's annual
         report pursuant to Section 15(d) of the Securities Exchange Act of
         1934) that is incorporated by reference in the registration statement
         shall be deemed to be a new



                                        8

<PAGE>   9

         registration statement relating to the securities offered therein, and
         the offering of such securities at that time shall be deemed to be the
         initial bona fide offering thereof.

3.       Insofar as indemnification for liabilities arising under the Securities
         Act of 1933 may be permitted to directors, officers and controlling
         persons of the registrant pursuant to the foregoing provisions, or
         otherwise, the registrant has been advised that in the opinion of the
         Securities and Exchange Commission such indemnification is against
         public policy as expressed in the Act and is, therefore, unenforceable.
         In the event that a claim for indemnification against such liabilities
         (other than the payment by the registrant of expenses incurred or paid
         by a director, officer or controlling person of the registrant in the
         successful defense of any action, suit or proceeding) is asserted by
         such director, officer or controlling person in connection with the
         securities being registered, the registrant will, unless in the opinion
         of its counsel the matter has been settled by controlling precedent,
         submit to a court of appropriate jurisdiction the question whether such
         indemnification by it is against public policy as expressed in the Act
         and will be governed by the final adjudication of such issue.


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the issuer
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8, and has


                                        9

<PAGE>   10

duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunder duly authorized, in the Township of Readington and 
the State of New Jersey on the 15th day of November, 1995.


                                      Merck & Co., Inc.

                                            By                *
                                                -------------------------------
                                                Raymond V. Gilmartin
                                                (Chairman of the Board,
                                                President and Chief Executive
                                                Officer)

                                            By  /s/ Celia A. Colbert
                                                -------------------------------
                                                Celia A. Colbert
                                                (Secretary and
                                                Assistant General Counsel)
                                                (Attorney-in-Fact)


         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated.

<TABLE>
<CAPTION>
Signatures                                 Title                                    Date
- ----------                                 -----                                    ----
<S>                                   <C>
              *                       Chairman of the Board, President        November 15, 1995
- -------------------------------       and Chief Executive Officer;                             
Raymond V. Gilmartin                  Principal Executive Officer
                                      and Director                             
                                                                                               
              *                       Senior Vice President and Chief         November 15, 1995
- -------------------------------       Financial Officer; Principal                             
Judy C. Lewent                        Financial Officer                                        
                                                                                               
              *                       Vice President, Controller;             November 15, 1995
- -------------------------------       Principal Accounting Officer                              
Peter E. Nugent                                                                                
                                                                             
              *                       Director                                November 15, 1995                  
- -------------------------------                                                                
H. Brewster Atwater, Jr.                                                                       
</TABLE>                                                              


                                       10

<PAGE>   11
<TABLE>
<S>                                             <C>                     <C>
               *
- -------------------------------                 Director                November 15, 1995
Derek Birkin
               *
- -------------------------------                 Director                November 15, 1995
Lawrence A. Bossidy
               *
- -------------------------------                 Director                November 15, 1995
William G. Bowen
               *
- -------------------------------                 Director                November 15, 1995
Johnnetta B. Cole
               *
- -------------------------------                 Director                November 15, 1995
William N. Kelley
               *
- -------------------------------                 Director                November 15, 1995
Samuel O. Thier
               *
- -------------------------------                 Director                November 15, 1995
Dennis Weatherstone
</TABLE>

* Celia A. Colbert, by signing her name hereto, does hereby sign this
  document pursuant to powers of attorney duly executed by the persons named,
  filed with the Securities and Exchange Commission as an exhibit to this
  document, on behalf of such persons, all in the capacities and on the date
  stated, such persons including a majority of the directors of the Company.

                                            By  /s/  Celia A. Colbert
                                                -------------------------------
                                                Celia A. Colbert
                                                (Secretary and Assistant
                                                General Counsel)
                                                (Attorney-in-Fact)


                                       11

<PAGE>   12

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement on Form S-8 of our
report dated January 24, 1995 included in and incorporated by reference in the
Annual Report on Form 10-K of Merck & Co., Inc. as amended by Form 10-K/A filed
on June 29,1995 for the year ended December 31, 1994 and to all references to
our Firm included in this Registration Statement.


                                            /s/ ARTHUR ANDERSEN LLP


New York, N.Y.

November 15, 1995


                                       12

<PAGE>   13

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT NUMBER                  DESCRIPTION                                 METHOD OF FILING
<S>                    <C>                                            <C>
4(a)                   --Restated Certificate of Incorporation        --Incorporated by reference to Form 10-
                       of the registrant (May 6, 1992)                K Annual Report for the fiscal year
                                                                      ended December 31, 1992

4(b)                   --By-Laws of the registrant (as amended        --Incorporated by reference to Form 10-
                       effective June 9, 1994)                        K Annual Report for the fiscal year
                                                                      ended December 31, 1994

5                      --Opinion and Consent of Mary M.               Filed with this Registration Statement
                       McDonald, General Counsel of registrant

23                     --Consent of Arthur Andersen LLP               Included at Page 12 of this
                                                                      Registration Statement

24                     --Certified Resolution of Board of             Filed with this Registration Statement
                       Directors and Power of Attorney
</TABLE>


                                       13
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{"company-data": {"conformed-name": "MERCK & CO INC", "cik": "0000064978", "assigned-sic": "2834", "irs-number": "221109110", "state-of-incorporation": "NJ", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "033-64273", "film-number": "95593774"}, "business-address": {"street1": "ONE MERCK DR", "street2": "P O BOX 100", "city": "WHITEHOUSE STATION", "state": "NJ", "zip": "08889-0100", "phone": "9084234044"}, "mail-address": {"street1": "ONE MERCK DR", "street2": "PO BOX 100 WS3AB-05", "city": "WHITEHOUSE STATION", "state": "NJ", "zip": "08889-0100"}}
1

  As filed with the Securities and Exchange Commission on November 15, 1995

                                              Registration No. 33-
- -------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM S-8

                             REGISTRATION STATEMENT
                                     under
                           THE SECURITIES ACT OF 1933

                               MERCK & CO., INC.
               (Exact name of issuer as specified in its charter)

                                 P.O. BOX 1000
                   WHITEHOUSE STATION, NEW JERSEY 08889-0100
                    (Address of Principal Executive Offices)

NEW JERSEY                                                           22-1109110
(State of Incorporation)                   (I.R.S. Employer Identification No.)

                           1996 INCENTIVE STOCK PLAN
                    NON-EMPLOYEE DIRECTORS STOCK OPTION PLAN
             MERCK EMPLOYEES FEDERAL CREDIT UNION STOCK OPTION PLAN

                           (Full title of the plans)

                                CELIA A. COLBERT
                    Secretary and Assistant General Counsel
                               MERCK & CO., INC.
                                  P.O. Box 100
                   Whitehouse Station, New Jersey 08889-0100
                                 (908) 423-1000
           (Name, address and telephone number of agent for service)

 If any of the securities being registered on this Form are to be offered on a
  delayed or continuous basis pursuant to Rule 415 under the Securities Act of
    1933, other than securities offered only in connection with dividend or
            interest reinvestment plans, check the following box./x/

                        CALCULATION OF REGISTRATION FEE
============================================================================================================
     Title of Securities                 Amount              Proposed            Proposed        Amount of
      to be registered                    to be               maximum            maximum        registration
                                       registered         offering price        aggregate           fee
                                                            per share*       offering price*
- ------------------------------------------------------------------------------------------------------------
Common Stock (no Par Value)..       65,232,500 shares       $58.0625          $3,787,562,031     $757,512.41
============================================================================================================
*  The prices stated above are estimated solely for the purpose of determining
the registration fee and are based on the average of the high and low market
prices of the stock as reported on the composite tape of New York Stock Exchange
listed issues on November 8, 1995.

- -------------------------------------------------------------------------------
2

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

         The following documents filed by the registrant (Exchange Act File No.
1-3305) with the Securities and Exchange Commission are incorporated herein by
reference and made a part hereof:

(a)  Annual Report on Form 10-K, dated March 22, 1995 for the fiscal year ended
     December 31, 1994;

(b)  Form 10-K/A filed on June 29, 1995, amending Merck's Annual Report on Form
     10-K for the fiscal year ended December 31, 1994.

(c)  Quarterly Report on Form 10-Q filed on May 11, 1995 for the quarter ended
     March 31, 1995;

(d)  Quarterly Report on Form 10-Q filed on August 10, 1995 for the quarter
     ended June 30, 1995;

(e)  Quarterly Report on Form 10-Q filed on November 13, 1995 for the quarter
     ended September 30, 1995;

(f)  Current Report on Form 8-K filed on July 19, 1995;

                                       2
3

(g)  Current Report on Form 8-K filed on October 4, 1995;

(h)  Proxy Statement for the Annual Meeting of Stockholders held on April 25,
     1995;

(i)  The descriptions of the Common Stock of the registrant set forth in the
     registrant's Registration Statements pursuant to Section 12 of the Exchange
     Act, and any amendment or report filed for the purpose of updating such
     description.

         All documents filed by the registrant pursuant to Section 13, 14 or
15(d) of the Exchange Act from the date hereof and prior to the termination of
the offering of the securities offered hereby shall be deemed to be incorporated
by reference herein and to be a part hereof from the date of filing of such
documents. An Exhibit Index can be found on page 13 of this Registration
Statement.

ITEM 4.  DESCRIPTION OF SECURITIES

         Not applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

         The validity of the Common Stock will be passed upon for the Company by
Mary M. McDonald, Senior Vice President and General Counsel of the Company. Ms.
McDonald is eligible to participate in the Plans and does participate.

                                       3
4

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The New Jersey Business Corporation Act provides that a New Jersey
corporation has the power to indemnify a director or officer against his or her
expenses and liabilities in connection with any proceeding involving the
director or officer by reason of his or her being or having been such a director
or officer, other than a proceeding by or in the right of the corporation, if
such a director or officer acted in good faith and in a manner he or she
reasonably believed to be in or not opposed to the best interests of the
corporation; and with respect to any criminal proceeding, such director or
officer had no reasonable cause to believe his or her conduct was unlawful.

         The indemnification and advancement of expenses shall not exclude any
other rights, including the right to be indemnified against liabilities and
expenses incurred in proceedings by or in the right of the corporation, to which
a director or officer may be entitled under a certificate of incorporation,
bylaw, agreement, vote of shareholders, or otherwise; provided that no
indemnification shall be made to or on behalf of a director or officer if a
judgment or other final adjudication adverse to the director or officer
establishes that his or her acts or omissions (a) were in breach of his or her
duty of loyalty to the corporation or its shareholders, (b) were not in good
faith or involved in a knowing violation of law or (c) resulted in receipt by
the director or officer of an improper personal benefit.

                                        4
5

         The Company's Restated Certificate of Incorporation provides that, to
the fullest extent permitted by the laws of the State of New Jersey, directors
and officers of the Company shall not be personally liable to the Company or its
stockholders for damages for breach of any duty owed to the Company or its
stockholders, except that a director or officer shall not be relieved from
liability for any breach of duty based upon an act or omission (a) in breach of
such person's duty of loyalty to the Company or its stockholders, (b) not in
good faith or involving a knowing violation of law or (c) resulting in receipt
by such person of an improper personal benefit.

         The By-Laws of the Company provide that a former, present or future
director, officer or employee of the Company or the legal representative of any
such director, officer or employee shall be indemnified by the Company:

                 (a) against reasonable costs, disbursements and counsel fees
         paid or incurred where such person has been successful in the defense
         on the merits or otherwise of any pending, threatened or completed
         civil, criminal, administrative or arbitrative action, suit or
         proceeding, brought by reason of such person's being or having been
         such director, officer or employee, and

                 (b) with respect to the defense of any such action, suit,
         proceeding, inquiry or investigation for which indemnification is not
         made under (a) above, against reasonable costs, disbursements (which
         shall include amounts paid in satisfaction of settlements, judgments,
         fines and penalties, exclusive, however, of any amount paid or payable
         to the

                                        5
6

         Company) and counsel fees if such person acted in good faith and in a
         manner such person reasonably believed to be in or not opposed to the
         best interests of the Company, and in connection with any criminal
         proceedings such person also had no reasonable cause to believe the
         conduct was unlawful, with the determination as to whether the
         applicable standard of conduct was met to be made by a majority of the
         members of the Board of Directors (sitting as a Committee of the Board)
         who were not parties to such inquiry, investigation, action, suit or
         proceeding or by any one or more disinterested counsel to whom the
         question may be referred by the Board of Directors; provided, however,
         in connection with any proceeding by or in the right of the Company, no
         indemnification shall be provided as to any person adjudged by any
         court to be liable to the Company except as and to the extent
         determined by such court.

         The Company enters into indemnification agreements with its directors
and officers and enters into insurance agreements on its own behalf. The
indemnification agreements provide that the Company agrees to hold harmless and
indemnify its directors and officers to the fullest extent authorized or
permitted by the Business Corporation Act of the State of New Jersey, or any
other applicable law, or by any amendment thereof or other statutory provisions
authorizing or permitting such indemnification that is adopted after the date
hereof. Without limiting the generality of the foregoing, the Company agrees to
hold harmless and indemnify its directors and officers to the fullest extent
permitted by applicable law against any and all expenses, judgments, fines, and
amounts paid in settlement actually and reasonably incurred by its directors and
officers in connection with the defense of any present or future threatened,
pending, or completed claim,

                                        6
7

action, suit, or proceeding by reason of the fact that they were, are, shall be,
or shall have been a director or officer of the Company, or are or were serving,
shall serve, or shall have served, at the request of the Company, as director or
officer of another corporation, partnership, joint venture, trust, employee
benefit plan, or other enterprise.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

         Not applicable.

ITEM 8.  EXHIBITS
Exhibit        Description                                            Method of Filing
Number         -----------                                            ----------------
- ------
4(a)           --Restated Certificate of Incorporation of the         Incorporated by reference to Form 10-K
               registrant (May 6, 1992)                               Annual Report for the fiscal year ended
                                                                      December 31, 1992

4(b)           --By-Laws of the registrant (as amended effective      Incorporated by reference to Form 10-K
               June 9, 1994)                                          Annual Report for the fiscal year ended
                                                                      December 31, 1994

5              --Opinion and Consent of Mary M. McDonald,             Filed with this Registration Statement
               General Counsel of registrant

23             --Consent of Arthur Andersen LLP                       Included at Page 12 of this Registration
                                                                      Statement

24             -- Certified Resolution of Board of Directors and      Filed with this Registration Statement
               Power of Attorney
7
8

ITEM 9.  UNDERTAKINGS

         The undersigned registrant hereby undertakes:

1. (a)   To file, during any period in which offers or sales are being made, a
         post-effective amendment to the registration statement to include any
         material information with respect to the plan of distribution not
         previously disclosed in the registration statement or any material
         change to such information in the registration statement.

   (b)   That, for the purpose of determining any liability under the Securities
         Act of 1933, each such post-effective amendment shall be deemed to be a
         new registration statement relating to the securities offered therein,
         and the offering of such securities at that time shall be deemed to be
         the initial bona fide offering thereof.

   (c)   To remove from registration by means of a post-effective amendment any
         of the securities being registered which remain unsold at the
         termination of the offering.

2.       That, for purposes of determining any liability under the Securities
         Act of 1933, each filing of the registrant's annual report pursuant to
         Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (and,
         where applicable, each filing of an employee benefit plan's annual
         report pursuant to Section 15(d) of the Securities Exchange Act of
         1934) that is incorporated by reference in the registration statement
         shall be deemed to be a new

                                        8
9

         registration statement relating to the securities offered therein, and
         the offering of such securities at that time shall be deemed to be the
         initial bona fide offering thereof.

3.       Insofar as indemnification for liabilities arising under the Securities
         Act of 1933 may be permitted to directors, officers and controlling
         persons of the registrant pursuant to the foregoing provisions, or
         otherwise, the registrant has been advised that in the opinion of the
         Securities and Exchange Commission such indemnification is against
         public policy as expressed in the Act and is, therefore, unenforceable.
         In the event that a claim for indemnification against such liabilities
         (other than the payment by the registrant of expenses incurred or paid
         by a director, officer or controlling person of the registrant in the
         successful defense of any action, suit or proceeding) is asserted by
         such director, officer or controlling person in connection with the
         securities being registered, the registrant will, unless in the opinion
         of its counsel the matter has been settled by controlling precedent,
         submit to a court of appropriate jurisdiction the question whether such
         indemnification by it is against public policy as expressed in the Act
         and will be governed by the final adjudication of such issue.

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the issuer
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8, and has

                                        9
10

duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunder duly authorized, in the Township of Readington and 
the State of New Jersey on the 15th day of November, 1995.

                                      Merck & Co., Inc.

                                            By                *
                                                -------------------------------
                                                Raymond V. Gilmartin
                                                (Chairman of the Board,
                                                President and Chief Executive
                                                Officer)

                                            By  /s/ Celia A. Colbert
                                                -------------------------------
                                                Celia A. Colbert
                                                (Secretary and
                                                Assistant General Counsel)
                                                (Attorney-in-Fact)

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated.
Signatures                                 Title                                    Date
- ----------                                 -----                                    ----
*                       Chairman of the Board, President        November 15, 1995
- -------------------------------       and Chief Executive Officer;                             
Raymond V. Gilmartin                  Principal Executive Officer
                                      and Director                             
                                                                                               
              *                       Senior Vice President and Chief         November 15, 1995
- -------------------------------       Financial Officer; Principal                             
Judy C. Lewent                        Financial Officer                                        
                                                                                               
              *                       Vice President, Controller;             November 15, 1995
- -------------------------------       Principal Accounting Officer                              
Peter E. Nugent                                                                                
                                                                             
              *                       Director                                November 15, 1995                  
- -------------------------------                                                                
H. Brewster Atwater, Jr.
10
11
*
- -------------------------------                 Director                November 15, 1995
Derek Birkin
               *
- -------------------------------                 Director                November 15, 1995
Lawrence A. Bossidy
               *
- -------------------------------                 Director                November 15, 1995
William G. Bowen
               *
- -------------------------------                 Director                November 15, 1995
Johnnetta B. Cole
               *
- -------------------------------                 Director                November 15, 1995
William N. Kelley
               *
- -------------------------------                 Director                November 15, 1995
Samuel O. Thier
               *
- -------------------------------                 Director                November 15, 1995
Dennis Weatherstone
* Celia A. Colbert, by signing her name hereto, does hereby sign this
  document pursuant to powers of attorney duly executed by the persons named,
  filed with the Securities and Exchange Commission as an exhibit to this
  document, on behalf of such persons, all in the capacities and on the date
  stated, such persons including a majority of the directors of the Company.

                                            By  /s/  Celia A. Colbert
                                                -------------------------------
                                                Celia A. Colbert
                                                (Secretary and Assistant
                                                General Counsel)
                                                (Attorney-in-Fact)

                                       11
12

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

         As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement on Form S-8 of our
report dated January 24, 1995 included in and incorporated by reference in the
Annual Report on Form 10-K of Merck & Co., Inc. as amended by Form 10-K/A filed
on June 29,1995 for the year ended December 31, 1994 and to all references to
our Firm included in this Registration Statement.

                                            /s/ ARTHUR ANDERSEN LLP

New York, N.Y.

November 15, 1995

                                       12
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                                  EXHIBIT INDEX
EXHIBIT NUMBER                  DESCRIPTION                                 METHOD OF FILING
4(a)                   --Restated Certificate of Incorporation        --Incorporated by reference to Form 10-
                       of the registrant (May 6, 1992)                K Annual Report for the fiscal year
                                                                      ended December 31, 1992

4(b)                   --By-Laws of the registrant (as amended        --Incorporated by reference to Form 10-
                       effective June 9, 1994)                        K Annual Report for the fiscal year
                                                                      ended December 31, 1994

5                      --Opinion and Consent of Mary M.               Filed with this Registration Statement
                       McDonald, General Counsel of registrant

23                     --Consent of Arthur Andersen LLP               Included at Page 12 of this
                                                                      Registration Statement

24                     --Certified Resolution of Board of             Filed with this Registration Statement
                       Directors and Power of Attorney
13