Phentermine belongs to a class of medications called anoretics, which decrease your appetite by acting on your central nervous system. Phentermine is also classified as a stimulant, with actions similar to amphetamines. Phentermine is usually prescribed as a weight-loss pill for obese individuals who have other health problems, such as high cholesterol, high blood pressure or diabetes.
Dosage
Phentermine comes in two forms: extended-release capsules and tablets. Both forms of phentermine can be taken as a single dose in the morning or three times per day, 30 minutes before each meal. Some phentermine tablets can be crushed or split, but if you are prescribed the extended-release capsules, take them whole.
Although the length of treatment depends on your individual condition, most phentermine treatments last between three and six weeks.
Side Effects
Like most medications, phentermine has the potential to cause unpleasant side effects. Some possible side effects include diarrhea, constipation, vomiting, dry mouth and unpleasant taste in the mouth. These side effects are not usually considered serious. Other side effects, such as dizziness, tremor, chest pain, increased blood pressure, heart palpitations and edema, are considered serious. If you experience any of these side effects while taking phentermine, contact your doctor immediately.
Contraindications
You should not take phentermine if you high blood pressure, coronary artery disease or other forms of heart disease. Those with glaucoma or hyperthyroidism should also avoid phentermine.
Phentermine may interact with MAO inhibitors, insulin medications, antidepressants and anti-anxiety medications. Inform your doctor if you are currently taking these medications or if you have taken these medications within two weeks of being given a phentermine prescription.
Warnings
Taking phentermine in conjunction with other weight medications, such as fenfluramine or dexfenfluramine, can cause a potentially fatal lung disorder called pulmonary hypertension, which is characterized by high blood pressure in the arteries of the lungs, called the pulmonary arteries.
Because of its amphetamine-like effects, phentermine may be habit-forming. Do not take phentermine for longer than prescribed by your doctor. If you have a history of drug abuse, you should not take phentermine.
Considerations
MayoClinic.com notes that many people who stop taking phentermine regain the weight they lost. To prevent regaining weight, take phentermine in addition to following a healthy eating and exercise plan. This can provide you with the basis you need to continue successful weight loss after your prescription ends.
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