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Phentermine is a contraction of âphenyl-tertiary-butylamineâ. It is an anorectic drug of the substituted amphetamine and phenethylamine chemical classes and has a pharmacology similar to amphetamine. It is used by people as an appetite suppressant.
Phentermine - Medical uses. 1  Phentermine is used for a short period of time to promote weight loss, if exercise and calorie reduction are not sufficient, and in addition to exercise and calorie reduction. [1] [3] 2  Phentermine is approved for up to 12 weeks of use and most weight loss occurs in the first weeks. [3]