Atorvastatin (Lipitor): Pfizer sued Dr Reddy’s for the infringement of Polymorph patent

Innovator Pfizer has sued generic player Dr. Reddy’s on Dec 8, 2009 for filing ANDA with Para IV certification against Orange Book listed patents for Atorvastatin (Lipitor) tablets in the U.S. District Court for the District of Delaware

Innovator has asserted following polymorph patent against generic player:

US5969156 (Expiry: June 8th, 2017): Which covers various hydrated Polymorphs of Atorvastatin (Form I, II and IV)

As per complaint filed in the U.S. District Court for the District of Delaware, innovator has requested court to block generic version till the expiry of crystalline polymorphic form patent.

Earlier, Dr. Reddy’s lab send Para IV certification letter to innovator Pfizer against Orange Book listed patents for Atorvastatin (Lipitor) tablets on Oct 26, 2009 .