Ironwood Pharmaceuticals, Inc. is a biotechnology company focused on developing and commercializing therapies for gastrointestinal (GI) and rare diseases in the United States and internationally. It sells linaclotide, a guanylate cyclase type-C (GC-C) agonist, under the LINZESS and CONSTELLA names for adults with irritable bowel syndrome with constipation or chronic idiopathic constipation, and for pediatric patients with functional constipation. The company is also developing IW-3300, a GC-C agonist for visceral pain conditions including interstitial cystitis/bladder pain syndrome and endometriosis, and Apraglutide, a synthetic peptide long-acting analog of glucagon-like peptide-2 for short bowel syndrome patients dependent on parenteral support and for acute graft versus host disease. It has strategic partnerships with AbbVie Inc., AstraZeneca AB, and Astellas Pharma Inc. for the development and commercialization of linaclotide. Formerly known as Microbia, Inc., it changed its name to Ironwood Pharmaceuticals, Inc. in April 2008, was incorporated in 1998, and is headquartered in Boston, Massachusetts.