Phentermine is a type of stimulant that belongs to a class of medications called anoretics. Phentermine acts on the central nervous system, working by suppressing your appetite. Phentermine is meant to be used to accelerate weight loss in overweight people who are also exercising and following a low-calorie diet plan.
Dosage
Phentermine comes in two forms: a tablet and an extended-release capsule. Dosage can range from one time per day to up to three times per day, approximately 30 minutes before meals. According to the National Center for Biotechnology Information, phentermine is habit-forming so it should only be used for three to six weeks. Length of treatment depends on your case and how well you respond to the medication.
Side Effects
Phentermine has the potential to cause a variety of different side effects, says PubMed Health. Some of the most common include dry mouth, diarrhea, constipation, vomiting and an odd taste in the mouth. Although uncomfortable, these side effects aren't generally considered serious. But some side effects can be serious. Potentially serious side effects include heart palpitations, increased blood pressure, dizziness, tremor, insomnia, shortness of breath, chest pain, swelling of the legs and ankles and restlessness. If you experience any of these side effects, contact your doctor immediately.
Considerations
When taking any medications, including phentermine, it's important to inform your doctor if you're taking any other medications, nutritional supplements or herbs. Phentermine may interfere with the action of insulin, so it's also important to inform your doctor if you are diabetic or regularly taking insulin, says Drugs.com. During your course of treatment, your doctor performs laboratory tests to check how your body is responding to the medication. See your doctor regularly so you can undergo these tests. Those with heart disease, coronary artery disease, high blood pressure, hyperthyroidism or glaucoma should not take phentermine. Those with a history of drug or alcohol abuse should also avoid phentermine, because the medication can be habit-forming.
Warnings
If taken in conjunction with other diet medications, especially fenfluramine or dexfenfluramine, phentermine can cause a fatal lung disease called pulmonary hypertension. Phentermine should not be taken with any other diet medications or appetite suppressants, says Drugs.com. It's also important to stop using phentermine gradually. If you stop taking the medication suddenly, you may experience withdrawal symptoms.
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