Ironwood Pharmaceuticals, Inc. is a pharmaceutical company. The Company has a product, linaclotide, which is available in the United States and Mexico under the brand name LINZESS, and is available in European countries and Canada under the brand name CONSTELLA. Linaclotide is also being developed and commercialized in other parts of the world by certain of its partners. Linaclotide provides patients and healthcare practitioners with a treatment option for adults in the United States and certain other countries with irritable bowel syndrome with constipation (IBS-C) and chronic idiopathic constipation (CIC) and gastrointestinal (GI) disorders. The Company in collaboration with Astellas Pharma Inc. (Astellas) is developing linaclotide for the treatment of patients with IBS-C.