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- What is phentermine?
- What brand names are available for phentermine?
- Is phentermine available as a generic drug?
- Do I need a prescription for phentermine?
- Why is phentermine prescribed to patients?
- What are the side effects of phentermine?
- What is the dosage for phentermine?
- Which drugs or supplements interact with phentermine?
- Is phentermine safe to use during pregnancy or while breastfeeding?
- What else should I know about phentermine?
Why is phentermine prescribed to patients?
- Phentermine is combined with diet and exercise for the short-term treatment of obesity in individuals with a body mass index greater than or equal to 30 kg/m2 or greater than or equal to 27 kg/m2 with risk factors for heart disease.
- Phentermine should not be combined with other weight loss agents.
- The combination of phentermine and fenfluramine (FEN-PHEN) is associated with serious heart problems. Fenfluramine is no longer available in the United States.
What are the side effects of phentermine?
Side effects of phentermine include:
- dry mouth,
- an unpleasant taste,
- high blood pressure, and
- fast heart rates (palpitations).
Central nervous system side effects include:
Phentermine, especially when combined with fenfluramine, has been associated with high pressures in the pulmonary arteries (pulmonary hypertension) and defects in heart valves, both serious complications.
Physical and psychological dependence may occur with the long-term use of phentermine. A withdrawal reaction, which includes excessive drowsiness, fatigue, tremors and depression may occur after prolonged use.
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.
Need help identifying pills and medications?
Use the pill identifier tool on RxList.