| Main Entry: | fen-phen |
| Part of Speech: | n |
| Definition: | a former prescription diet drug of fenfluramine hydrochloride or dexfenfluramine combined with phentermine, and now banned; also called phen-fen |
| Etymology: | 1994-99; fenfluramine + phentermine |
fen-phen (fěn'fěn)
n.
A combination of two drugs, fenfluramine hydrochloride and phentermine, formerly prescribed for weight loss.