Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported)          October 18, 2001

                                MERCK & CO., Inc.
             (Exact Name of Registrant as Specified in Its Charter)

                                   New Jersey
                 (State or Other Jurisdiction of Incorporation)

          1-3305                                      22-1109110
  (Commission File Number)                (I.R.S. Employer Identification No.)

One Merck Drive, PO Box 100, Whitehouse Station, NJ              08889-0100
    (Address of Principal Executive Offices)                     (Zip Code)

Registrant's telephone number, including area code              (908) 423-1000

Item 7. Financial Statements and Exhibits

      (c) Exhibits

      Exhibit 99(a)  Press release issued                         Filed with
                     October 18, 2001 regarding                   this document
                     earnings for third quarter

      Exhibit 99(b)  Certain supplemental information             Filed with
                     not included in the press release            this document

Item 9. Regulation FD Disclosure

Incorporated by reference is a press release issued by the Registrant on October
18, 2001, attached as Exhibit 99(a), regarding earnings for third quarter. Also
incorporated by reference is certain supplemental information not included in
the press release, attached as Exhibit 99(b). This information is not "filed"
pursuant to the Securities Exchange Act and is not incorporated by reference
into any Securities Act registration statements. Additionally, the submission of
this report on Form 8-K is not an admission as to the materiality of any
information in this report that is required to be disclosed solely by Regulation


         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 hereunto duly authorized.

                                                       MERCK & CO., Inc.

Date:  October 18, 2001                                By: /s/ Debra A. Bollwage
                                                           DEBRA A. BOLLWAGE
                                                           Assistant Secretary

                                  EXHIBIT INDEX

Number                         Description
------                         -----------
 99(a)                         Press release issued October 18, 2001
                               regarding earnings for third quarter

 99(b)                         Certain supplemental information not
                               included in the press release