Phentermine is a medication often prescribed as a short-term weight loss aid. However, does phentermine work?
Only short studies have evaluated the effectiveness of medications like phentermine. In these studies, people taking these drugs lost more weight than those not taking them, but the difference was small (only a fraction of a pound more per week for the people taking the weight loss medication). Studies also suggest that the effects of these medications on weight loss decrease after the first few weeks.
Phentermine should be combined with an appropriate diet. It is not meant to be used without dieting. You should never take this medicine more often or at higher doses than prescribed, as this can lead to addiction or dependence (phentermine is a controlled substance that has a significant potential for abuse).
(Click Phentermine for more information about the effectiveness of this medication, how it works, and potential side effects to be aware of.)
Written by/reviewed by: Kristi Monson, PharmD;Arthur Schoenstadt, MD
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Briggs GG, Freeman RK, Yaffe SJ. Drugs in Pregnancy and Lactation. 7th ed. Philadelphia (PA): Lippincott, Williams & Wilkins; 2005.
Red Book: Pharmacy's Fundamental Reference. 2007 ed. Montvale (NJ): Thomson Healthcare; 2007.
Phentermine. Drug Facts and Comparisons. Drug Facts and Comparisons 4.0 [online]. 2012. Available from Wolters Kluwer Health, Inc. Accessed April 6, 2012.
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