Global pharmaceutical giant Pfizer Inc has sued the Hyderabad-based drug firm Aurobindo Pharma Ltd alleging patent infringement pertaining to its cholesterol lowering drug Lipitor. Lipitor, which is among the best selling drugs in the US markets, had annual sales of over $7 billion last year, according to the US Food and Drug Administration. Earlier, Pfizer, which claims patents on the drug until 2017, had sued a number of global and Indian generic drug firms including Ranbaxy and Dr Reddy’s alleging patent infringement pertaining to Lipitor.
