Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Canan John
 2. Date of Event Requiring Statement (Month/Day/Year)
09/01/2006		 3. Issuer Name and Ticker or Trading Symbol
MERCK & CO INC [(MRK)]
(Last)
(First)
(Middle)
ONE MERCK DRIVE, P.O. BOX 100		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
V-P, Controller
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WHITEHOUSE STATION, NJ 08889-0100		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock - 401(k) Plan 1,669.7991 (1)
I
By 401(k) Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (1997/02/25 right to buy) 02/25/2002 02/24/2007 Common Stock 5,275 $ 46.3275 D  
Employee Stock Option (1998/02/24 right to buy) 02/24/2003 02/23/2008 Common Stock 5,275 $ 60.6345 D  
Employee Stock Option (1999/02/23 right to buy) 02/23/2004 02/22/2009 Common Stock 4,958 $ 76.8372 D  
Employee Stock Option (2000/02/22 right to buy) 02/22/2005 02/21/2010 Common Stock 12,660 $ 62.0859 D  
Employee Stock Option (2001/03/02 right to buy) 03/02/2006 03/01/2011 Common Stock 15,825 $ 75.7638 D  
Employee Stock Option (2002/03/01 right to buy) 03/01/2003(2) 02/29/2012 Common Stock 15,825 $ 58.9105 D  
Employee Stock Option (2003/02/28 right to buy) 02/28/2004(3) 02/27/2013 Common Stock 18,990 $ 49.9626 D  
Employee Stock Option (2003/08/01 right to buy) 08/01/2004(4) 07/31/2013 Common Stock 3,165 $ 51.4697 D  
Employee Stock Option (2004/02/27 right to buy) 02/27/2005(5) 02/26/2014 Common Stock 10,000 $ 48.24 D  
Employee Stock Option (2004/11/01 right to buy) 11/01/2005(6) 10/31/2014 Common Stock 10,000 $ 28.9 D  
Employee Stock Option (2005/02/25 right to buy) 02/25/2006(7) 02/24/2015 Common Stock 10,000 $ 31.84 D  
Employee Stock Option (2006/02/01 right to buy) 02/01/2007(8) 01/31/2016 Common Stock 5,000 $ 34.47 D  
Employee Stock Option (2006/03/03 right to buy) 03/03/2007(9) 03/02/2016 Common Stock 21,000 $ 35.09 D  
Restricted Stock Units 2004/02/27 02/27/2007 02/27/2007 Common Stock 1,667 $ (10) D  
Restricted Stock Units 2005/02/25 02/25/2008 02/25/2008 Common Stock 1,667 $ (10) D  
RSU - Leader Shares 2004/01/15 01/15/2007 01/15/2007 Common Stock 4,000 $ (10) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Canan John
ONE MERCK DRIVE
P.O. BOX 100
WHITEHOUSE STATION, NJ 08889-0100		       V-P, Controller  

Signatures

John Canan 09/11/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Includes shares acquired and dividends earned through July 3, 2006 in the Merck & Co., Inc. Employee Savings and Security Plan, a 401(k) Plan.
(2) The option vests in three equal annual installments beginning March 1, 2003.
(3) The option vests in three equal annual installments beginning February 28, 2004.
(4) The option vests in three equal annual installments beginning August 1, 2004.
(5) The option vests in three equal annual installments beginning February 27, 2005.
(6) The option vests in three equal annual installments beginning November 1, 2005.
(7) The option vests in three equal annual installments beginning February 25, 2006.
(8) The option vests in three equal annual installments beginning February 1, 2007.
(9) The option vests in three equal annual installments beginning March 3, 2007.
(10) Each restricted stock unit represents a contingent right to receive one share of Merck & Co., Inc. common stock.
 
Remarks:
Exhibit Index
Exhibit 24 - Power of Attorney

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