Phentermine belongs to a class of medications called anoretics, which are used to accelerate weight loss in those who are following a low-calorie diet and exercise routine. Phentermine stimulates the central nervous system to release a neurotransmitter called norepinephrine, which reduces appetite. Phentermine is available as a prescription only and should only be used for a short time.
Usage
Phentermine is available in a tablet or extended-release capsule. Either type of medication can be taken either once per day in the morning or three times per day approximately 30 minutes prior to meals. Most treatment terms for phentermine last three to six weeks, although specific treatment length depends on your physical response to the medication. Extended-release capsules must be taken whole, not crushed or split.
Side Effects
Phentermine has the potential to cause a variety of side effects. Some of the most common side effects include diarrhea, constipation, vomiting, dry mouth and unpleasant taste in the mouth. Phentermine may also cause potentially serious side effects. Some serious side effects include increased blood pressure, heart palpitations, tremor, insomnia, dizziness, chest pain, shortness of breath and swelling of the legs and ankles. If you experience any of these side effects, contact your doctor immediately.
Contraindications
If you take a prescription medication called a monoamine oxidase, or MAO, inhibitor, you should not take phentermine. Life-threatening complications can occur if the two medications are taken in combination with each other. Taking phentermine with other weight-loss medications, such as dexfenfluramine or fenfluramine, may cause a life-threatening lung disorder called pulmonary hypertension. Phentermine should not be taken with any other diet medications. Drinking alcohol may increase your risk of developing side effects from phentermine.
Warnings
Do not take phentermine if you have heart disease, coronary artery disease, high blood pressure or hyperthyroidism. Phentermine is habit-forming, so it should not be used for an extended period of time or by people with a history of drug or alcohol abuse. According to Drugs.com, phentermine can travel through breast milk to a nursing baby, so do not nurse while taking this medication.
Considerations
Phentermine is intended to be used as part of a complete weight-loss program. To see results while taking phentermine, follow a low-calorie diet and engage in regular exercise.
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