Pfizer Inc has agreed to settle litigation related to its cholestrol drug Lipitor with Canadian generic drug maker Apotex Inc

"In July 2008, we entered into an agreement with Apotex to settle that litigation, subject to certain conditions," Pfizer said in a quarterly report filed with the U.S. Securities and Exchange Commission,

The company did not provide details of the agreement. Pfizer has been involved in patent litigation with Apotex to block the launch of generic Lipitor prior to the expiration of a patent that runs through July 2010.

In June, Pfizer settled most of its patent disputes with Ranbaxy Laboratories  allowing the Indian company to launch a generic version of Lipitor from Nov. 30, 2011.