March 16, 2009

Via Electronic Submission

United States Securities and Exchange Commission
Division of Corporation Finance
100 F Street N.E.
Washington, D.C. 20549

Attention:	Jeffrey Riedler, Assistant Director
Subject:	Alkermes, Inc.
	Form 10-K for the fiscal year ended March 31, 2008
	Filed May 30, 2008
	File No. 001-14131

Dear Mr. Riedler:

     We are requesting an extension of time to file our response to the matters addressed in your letter dated March 4, 2009. We request an extension to respond on or before March 31, 2009.

     If you have any questions with regard to this correspondence, please contact me at (617) 583-6651.

Sincerely,
 

/s/ Iain M. Brown  

Iain M. Brown 

Vice President of Finance