I do know that this drug is, or was, commonly prescribed. From U.S. Recall News : Xanodyne Pharmaceuticals, Inc. is cooperating with the FDA...

FDA: Darvocet Recall Due To 'Potentially Fatal Heart Abnormalities'
Info Post
I do know that this drug is, or was, commonly prescribed. From U.S. Recall News : Xanodyne Pharmaceuticals, Inc. is cooperating with the FDA...