Correction: Due to an error in court records, an earlier version of this article misidentified attorney Brian P. Kenney, the lawyer for lead whistleblower Lucia Paccione. Kenney is a partner with Kenney Egan McCafferty & Young in Plymouth Meeting, Pa.

To resolve a spate of whistleblower lawsuits, drug manufacturer Cephalon Inc. of Frazer, Pa., has agreed to pay $431 million in civil and criminal fines for illegally promoting “off-label” uses for three of its drugs, federal prosecutors said.