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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.
Manufacturers of phentermine diet pills have their own 37.5 mg dosages, Phentermine 37.5 mg tablets or capsules are generally manufactured by generic pharmaceutical groups.hentermine is FDA approved but it's currently being studied in combination with other medications for obesity. The first such combination is the appetite suppressant phentermine/topiramate (Qsymia, formerly Qnexa). In 2012, the FDA approved its sale in the United States.