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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.
Get help from a doctor now âº. Five days: Phentermine adult half-life is variable between 7 to 20 hours. It takes approximately 6 half lives for a drug to be eliminated from your system. 20*6/24=5 days.