Impax has initiated a challenge against patents listed by Daiichi Sankyo, Inc. in connection with its WELCHOL® (Colesevelam HCl) tablets, 625 mg by filing an ANDA containing a para IV certification for a generic version of WELCHOL® with the USFDA. Following receipt of the notice from the FDA that Impax's ANDA had been accepted for filing, Impax notified the NDA holder and patent owners of its paragraph IV certification. On January 14, 2010, Daiichi Sankyo, Inc. and Genzyme Corporation filed suit for patent infringement against Impax in the United States District Court for the District of Delaware. This action formally initiates the patent challenge process under the Hatch-Waxman Act. Based on the filing date of the ANDA, the Company believes that it is the first to file an ANDA with a paragraph IV certification and expects to be entitled to 180 days of market exclusivity. Once the ANDA is approved by FDA, Global Pharmaceuticals, Impax's generic division, will commercialize the products.
WELCHOL® is indicated as an adjunct to diet and exercise to reduce elevated low-density lipoprotein cholesterol (LDL-C) in adults with primary hyperlipidemia (Fredrickson Type IIa) as monotherapy or in combination with an hydroxymethyl-glutaryl-coenzyme A (HMG CoA) reductase inhibitor (statin), reduce LDL-C levels in boys and postmenarchal girls, 10 to 17 years of age, with heterozygous familial hypercholesterolemia as monotherapy or in combination with a statin after failing an adequate trial of diet therapy, and improve glycemic control in adults with type 2 diabetes mellitus. According to Wolters Kluwer Health, U.S. sales of WELCHOL® were approximately $308 million for the twelve-month period ending November 2009.
