Cipher Pharmaceuticals Inc announced that Purdue Pharma Products LP and Napp Pharmaceutical Group Ltd have filed a complaint against Cipher in the United States District Court for the Eastern District of Virginia, for alleged infringement of two US patents. The action relates to Cipher's New Drug Application (NDA) filed with the US Food and Drug Administration (FDA) for CIP Tramadol, the company's extended-release tramadol product.
The details can be read here.
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