"The US Food and Drug Administration (FDA) has approved an extended-release 20-mg, once-daily dosing option of lorcaserin, to be known as Belviq XR, for the treatment of obesity.
Belviq XR is slowly absorbed and lasts t"...
(Generic versions may still be available.)
Fastin Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Fastin (phentermine hydrochloride) is a type of appetite suppressant called a sympathomimetic amine used 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. The brand name drug Fastin is no longer available in the U.S. A generic version is available. Side effects of Fastin include:
- fast heart rate (tachycardia),
- elevated blood pressure,
- dry mouth,
- dry mouth,
- unpleasant taste in mouth,
- feeling uneasy,
- headache, and
- changes in sex drive.
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. Fastin may interact with alcohol. Tell your doctor all medications and supplements you use. Tell your doctor if you are pregnant or plan to become pregnant before using Fastin; it is unknown if it would affect a fetus. Consult your doctor before breastfeeding. Withdrawal symptoms may occur if you suddenly stop taking Fastin.
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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