Fen-Phen

a combination of fenfluramine (“fen”) and phentermine (“phen”) prescription medications approved separately for use as short-term appetite suppressants. Many doctors combined the two drugs and prescribed them for long-term use in the 1990s, but studies found that fen-phen caused heart damage and/or primary pulmonary hypertension (PPH), an incurable disease scarring the internal vasculature of the lungs and increasing the blood pressure in the lungs to dangerous levels.