Fastin

Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 10/12/2021
Fastin Side Effects Center

What Is Fastin?

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.

What Are Side Effects of Fastin?

Side effects of Fastin include:

Dosage for Fastin

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.

What Drugs, Substances, or Supplements Interact with Fastin?

Fastin may interact with alcohol. Tell your doctor all medications and supplements you use.

Fastin During Pregnancy or Breastfeeding

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.

Additional Information

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.

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Fastin Consumer Information

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Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have:

  • feeling short of breath, even with mild exertion;
  • chest pain, feeling like you might pass out;
  • swelling in your ankles or feet;
  • pounding heartbeats or fluttering in your chest;
  • tremors, feeling restless, trouble sleeping;
  • unusual changes in mood or behavior; or
  • increased blood pressure--severe headache, blurred vision, pounding in your neck or ears, anxiety, nosebleed.

Common side effects may include:

  • itching;
  • dizziness, headache;
  • dry mouth, unpleasant taste;
  • diarrhea, constipation, stomach pain; or
  • increased or decreased interest in sex.

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.

Read the entire detailed patient monograph for Fastin (Phentermine)

Fastin Professional Information

SIDE EFFECTS

Cardiovascular: Palpitation, tachycardia, elevation of blood pressure.

Central Nervous System: Overstimulation, restlessness, dizziness, insomnia, euphoria, dysphoria, tremor, headache; rarely psychotic episodes at recommended doses.

Gastrointestinal: Dryness of the mouth, unpleasant taste, diarrhea, constipation, other gastrointestinal disturbances.

Allergic: Urticaria.

Endocrine: Impotence, changes in libido.

Read the entire FDA prescribing information for Fastin (Phentermine)

© Fastin Patient Information is supplied by Cerner Multum, Inc. and Fastin Consumer information is supplied by First Databank, Inc., used under license and subject to their respective copyrights.

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