A weight loss drug made up of fenfluramine and phentermine. Its use has been linked to heart valve problems and has been banned by the FDA.
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Phen-Fen: The once-popular diet-drug combination of fenfluramine and phentermine that, amidst much media attention, was taken off the market because of concern for heart valve damage. See: Fenfluramine.Common Misspellings: phenphen
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