Definition of fen-phen
1
: a former diet drug combination of phentermine with either fenfluramine or dexfenfluramine
— called also phen-fen
2
: an herbal preparation typically containing ephedra and Saint-John's-wort that was used as an appetite suppressant until one of its ingredients (ephedra) was banned in the U.S. by the FDA in 2004
Herbal fen-phen users who take a cough or cold remedy containing decongestants, which are similar in action to ephedra, are unwittingly double-dosing on stimulants.— Richard Harkness
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Merriam-Webster unabridged
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Time Traveler for fen-phen
The first known use of fen-phen was in 1993
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