FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * LEWENT JUDY C   2. Issuer Name and Ticker or Trading Symbol MERCK & CO INC [(MRK)] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Exec.V.P.& C.F.O./Pres.HHA (Last) (First) (Middle) ONE MERCK DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 12/15/2005 (Street) WHITEHOUSE STATION, NJ 08889-0100 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 12/15/2005   M/K   129.202 A (1) 421,393.202 D   Common Stock 12/15/2005   D   0.202 D $ 29.77 421,393 D   Common Stock - 401(k) Plan               6,705.0459 (2) I By 401(k)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Phantom Stock

(1)

12/15/2005

A

129.202

12/15/2005

12/15/2005

Common Stock

129.202

$ 29.77

129.202

D

Phantom Stock

(1)

12/15/2005

M/K

129.202

12/15/2005

12/15/2005

Common Stock

129.202

(1)

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LEWENT JUDY C ONE MERCK DRIVE WHITEHOUSE STATION, NJ 08889-0100			Exec.V.P.& C.F.O./Pres.HHA

Signatures

Debra A. Bollwage as Attorney-in-Fact for Judy C. Lewent		12/19/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Each phantom stock unit was the equivalent of one share of Merck common stock. 129 represents the dividend equivalent and the appreciation of the dividend equivalent credited to participant's account on December 15, 2005 and the remaining .2020 was settled for cash.
(2)	Includes shares acquired and dividends earned through October 3, 2005 in the Merck & Co., Inc. Employee Savings and Security Plan, a 401(k) plan.

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