On August 30, 2012, Ironwood Pharmaceuticals, Inc. (the "Company") issued a press release with its U.S. partner, Forest Laboratories, Inc. announcing that the U.S. Food and Drug Administration has approved the Company's drug LINZESS™ (linaclotide) for adults with irritable bowel syndrome with constipation and chronic idiopathic constipation.

A copy of the press release is furnished as Exhibit 99.1 and is incorporated herein by reference.

(d) Exhibits.

Exhibit No.                                 Description

   99.1        Ironwood Pharmaceuticals, Inc. and Forest Laboratories, Inc. Press
               Release dated August 30, 2012