Phentermine is a stimulant similar to an amphetamine. Phentermine is an appetite suppressant that affects the central nervous system.

Phentermine is used together with diet and exercise to treat obesity (overweight) in people with risk factors such as high blood pressure, high cholesterol, or diabetes.

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  • Get emergency medical help if you have any of these signs of an allergic reaction: hives; wheezing, chest tightness, trouble breathing; swelling of your face, lips, tongue, or throat.

    Call your doctor at once if you have a serious side effect such as:

    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;
    confusion or irritability, unusual thoughts or behavior;
    feelings of extreme happiness or sadness; or
    dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, shortness of breath, uneven heartbeats, seizure).
    Common side effects may include:

    feeling restless or hyperactive;
    headache, dizziness, tremors;
    sleep problems (insomnia);
    dry mouth or an unpleasant taste in your mouth;
    diarrhea or constipation, upset stomach; or
    increased or decreased interest in sex, impotence.
  • Usual Adult Dose for Weight Loss 15 to 37.5 mg orally once a day before breakfast or 1 to 2 hours after breakfast. Usual Pediatric Dose for Weight Loss 17 years or older: 15 to 37.5 mg orally once a day before breakfast or 1 to 2 hours after breakfast.