Phentermine, prescribed under the brand names Adipex-P, Ionamin, Atti Plex P and Phentercot, belongs to a class of weight-loss drugs called anoretics. Phentermine acts on your central nervous system, which includes your brain and spinal cord, to decrease your appetite and prevent overeating. The weight-loss drug is available by prescription only and is approved by the U.S. Food and Drug Administration for short-term use of 12 weeks or less.
Dosage
Phentermine is used to accelerate weight loss in obese adults who are following a weight-loss diet and exercising regularly. It is available as a tablet or an extended-release capsule, which is either taken as a single dose upon waking or three times throughout the day, approximately 30 minutes before each meal. Some capsules may be crushed and mixed with food or drink, but the National Center for Biotechnology Information notes that if you are given an extended-release capsule, you should take it whole and not crush or split it.
Side Effects
Phentermine is one of the most commonly prescribed weight loss drugs, but it does carry the risk of side effects. Some possible and serious side effects include heart palpitations, restlessness, tremor, dizziness, insomnia, shortness of breath, chest pain, swelling of the legs and ankles and increased blood pressure. If you experience any of these serious side effects, contact your doctor immediately.
Warnings
Phentermine is considered habit-forming and is regarded as a controlled substance. Do not take phentermine for longer than your doctor recommends. Avoid using other weight loss supplements or medications while taking phentermine.
If you have heart disease, coronary artery disease, high blood pressure, glaucoma or hyperthyroidism, you should not take phentermine. Those with a history of drug abuse should also avoid phentermine. If you have diabetes, you may require a special dosage of phentermine, according to Drugs.com. If your doctor prescribes phentermine, make sure you follow instructions exactly to lower your chances of side effects.
Considerations
MayoClinic.com notes that while phentermine may be a good way to begin the weight-loss journey, many people regain weight once they stop using phentermine. To avoid this, make sure you follow a healthy diet and lifestyle while taking phentermine. Once you discontinue use of the weight-loss medication, a healthy diet and lifestyle will help promote further weight loss and ensure you do not regain the weight you lost.
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