Weight Loss Home > Phentermine

Phentermine is a weight loss medication that is available by prescription only. It works by suppressing the appetite and possibly increasing the metabolism. Phentermine, which is approved for short-term use only, is available in tablets, capsules, and orally disintegrating tablets. Potential side effects include dizziness, insomnia, and restlessness. The medication is a controlled substance, meaning it has the potential to be abused.

What Is Phentermine?

Phentermine is a prescription weight loss medication approved for short-term use only. It should be used in combination with a low-calorie diet, exercise, and behavior changes.
 
(Click Phentermine Uses for more information, including possible off-label uses.)
 

Phentermine Products

The differences between all the available phentermine products can be confusing. The medication was sold under several different brand names in the past (Fastin®, Ionamin®, Obestin-30®, Oby-Trim®, Ona-Mast®, Pre-Sate®, and Tora®), but these products are no longer available. One brand-name product is still available (Adipex-P®).
 
Phentermine is also available as an orally disintegrating tablet, Suprenza™ (orally disintegrating phentermine). An orally disintegrating tablet (ODT) is a tablet that is designed to be dissolved on the tongue instead of swallowed whole.
 
Generic phentermine 30 mg capsules come in two different colors. Blue capsules (with little beads) are generic for Fastin, while yellow capsules (with powder instead of beads) are generic for other phentermine products. There is no generic available for Ionamin, a long-acting form of phentermine that is no longer available.
 
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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