Painkiller patches containing the prescription medication fentanyl are being recalled, because a cut in the patch's drug reservoir may cause a harmful overdose of the potent painkiller. The affected patches are sold by PriCara under the Duragesic brand name. A generic version of the fentanyl patches is marketed by Sandoz Inc. The recall applies to all 25 microgram/hour fentanyl patches (brand name and generic) with expiration dates on or before December 2009. The recalled patches should be discarded immediately. PriCara is advising patients with recalled 25 mcg/hr Duragesic patches to call 800-547-6446, while patients with recalled 25 mcg/hr Sandoz Inc. should call 800-901-7236. In December 2007, the U.S. Food and Drug Administration (FDA) issued a Public Health Advisory on fentanyl patch misuse and risk of overdose.