noun Pharmacology.
a white, crystalline powder, phenyl-tertiary-butylamine hydrochloride, soluble in water and alcohol, that stimulates the central nervous system and elevates the systolic blood pressure: used chiefly in the treatment of obesity.

phen(yl)-ter(tiary-butyla)mine (hydrochloride) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

phentermine phen·ter·mine (fěn'tər-mēn')
An oily liquid whose crystalline hydrochloride form is used in the treatment of obesity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Those drugs were combined with the generic phentermine in the fen-phen combination.
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