Purdue Pharma, a Stamford-based drug maker focusing on pain relieving medicines, is suing two generic drug makers, alleging that they infringed on its patents for the narcotic OxyContin.
The company on Jan. 30 filed lawsuits in New York federal court against Epic Pharma of Laurelton, N.Y., and Impax Laboratories of Hayward, Calif., to block their use of the drug, which developed a reputation among abusers for its potency and addictive nature.