Schering-Plough's Nitro-Dur transdermal nitroglycerin patch has full FDA approval.
Executive Summary
SCHERING-PLOUGH NITRO-DUR NITRO PATCH SUPPLEMENTAL NDAs APPROVED by FDA on April 4, making the nitroglycerin transdermal infusion system the first pre-1962 nitroglycerin product in a patch form to have fully approved NDAs. FDA asked manufacturers of nitro patches to submit NDAs for the DESI drugs in a Federal Register notice of July 15, 1993 ("The Pink Sheet" July 19, 1993, T&G-2). Nitro-Dur and Ciba/Summit's Transderm-Nitro were then deemed the "reference drugs."