- Call 1.800.749.7934 Do You Qualify for the Fen Phen Class Action Suit Click Here ...one-third of a patient sampling of Fen-Phen diet pill users had evidence of heart valve disease. Mayo Clinic Study August 28, 1997 Fen Phen (Fenfluramine and Dexfenfluramine) - Redux & Pondimin In 1997 the FDA asked American Home Products, the makers of Pondimin (Fenfluramine) and Redux (Dexfenfluramine), to ...www.oklalaw.com