Alza, Gensia Pharmaceuticals Inc., Ethical Holdings plc., Elan Corp. regulatory update

U.S. patent No. 5,264,446 relates to nifedipine crystals with various surface areas as the active ingredient in a sustained-release formulation of nifedipine, the active drug in Procardia XL.

GNSA, ETHCY and ELN -companies that are developing and/or selling sustained-release products containing nifedipine - all claimed immunity from the '446 patent. ...