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(Generic versions may still be available.)
Fastin Side Effects Center
Pharmacy Editor: Melissa Conrad Stöppler, MD
Fastin (phentermine hydrochloride) is indicated in the management of exogenous obesity over the short term (a few weeks) as an adjunct to a regimen of weight reduction based on caloric restriction. A generic formulation is available. Fastin may cause tachycardia, elevation of blood pressure, overstimulation, restlessness, dizziness, insomnia, euphoria, and dryness of the mouth. Other side effects may occur. Consult your physician if you experience any possible side effects.
The recommended dose of Fastin is one capsule (30 mg) a day taken approximately 2 hours after breakfast for appetite control. Late evening medication should be avoided because of the possibility of resulting insomnia. Concomitant use of alcohol with Fastin may result in an adverse drug interaction. Safe use of Fastin during pregnancy has not been established. Use of Fastin by women who become pregnant requires that the potential benefit be weighed against the possible hazard to mother and infant.
Our Fastin Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Fastin FDA Prescribing Information: Side Effects
Read the entire FDA prescribing information for Fastin (Phentermine) »
Additional Fastin Information
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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