Phentermine, brand-name Adipex, is a medication used in conjunction with proper diet and exercise to increase weight loss. Phentermine is a stimulant that belongs to a class of drugs called anorectics, which work by blocking reactions in your central nervous system to help decrease your appetite.
Dosage
Phentermine is available in tablet form or as extended-release capsules. Phentermine may be taken once per day in the morning or 3 times per day before meals. It is best to take this medication about 30 minutes before your meal on an empty stomach. Tablets may be crushed or broken before ingestion, but if your doctor prescribes extended-release capsules, it is important to swallow them whole. Generally, doctors prescribe phentermine for a period of 3 to 6 weeks, although the National Center for Biotechnology Information notes that treatment periods may vary among individuals.
Considerations
Phentermine is not meant to replace a proper diet and exercise. If your doctor prescribes phentermine for you, it is important to follow any diet and exercise recommendations as well, because phentermine works best in conjunction with a proper diet program. Specific diet and exercise recommendations may vary, depending on your condition and activity level. It may be beneficial to work with a dietitian to determine the best diet program for you.
Side Effects
Phentermine has the potential to cause various side effects. Some common ones include diarrhea, constipation, dry mouth, vomiting and an unpleasant taste in the mouth. Although uncomfortable, these side effects are not serious. More serious side effects include increased blood pressure, heart palpitations, shortness of breath, muscle tremors, insomnia, chest pain, dizziness and swelling of the legs and ankles. If you experience any of these serious side effects, you should contact your doctor immediately.
Warnings
Phentermine is extremely habit-forming, so it should only be used for a short period of time and under strict supervision by your health care provider. Because of its potential for addiction, those with a history of drug or alcohol abuse should not use phentermine.
Taking phentermine in conjunction with other weight loss medications, such as fenfluramine and dexfenfluramine, can result in a fatal lung disease called pulmonary hypertension. You should not take phentermine in conjunction with other weight loss drugs.
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