Phentermine Precautions

Phentermine is in a class of medications that includes certain decongestants, stimulants and other appetite suppressants. Patients who are allergic to any of these types of medications should tell their doctor before taking phentermine. Patients should also inform their doctor of any other any other allergies that they have.

People who have certain medical conditions should not use phentermine. Patients should consult a doctor or pharmacist before using phentermine if they have uncontrolled hypertension, glaucoma, a history of alcohol or drug dependence, vascular disease, any kind of psychiatric condition, a hyperthyroid (overactive thyroid) condition, or if they have had a stroke.

Doctors should conduct a complete medical history before prescribing phentermine, especially if a patient is known to have diabetes, heart disease, kidney disease or a seizure disorder.

Patients who need to have surgery, including oral surgery, while taking phentermine should inform their doctor or dentist that they are using the drug.

While taking phentermine, caution should be used while driving or engaging in activities that require clear vision. In rare cases, dizziness or blurred vision may occur. Alcohol consumption should be avoided while taking phentermine.

Like any medication, phentermine is metabolized by the liver and excreted by the kidneys. Since kidney function declines with age, older people who take phentermine may be at a higher risk for side effects like dizziness and high blood pressure.

Pregnant women should not use phentermine unless it is absolutely necessary. Because it may harm an unborn baby, only low doses should be used around the time of a woman’s expected delivery date. Pregnant women should thoroughly discuss the risks and benefits of phentermine with their doctor before using the drug.

Infants born to women who have been using phentermine for an extended period of time or in high doses can have withdrawal symptoms such as irritability and extreme fatigue. If these symptoms occur in a newborn whose mother was taking phentermine during pregnancy, a doctor should be notified.

Since the drug can be passed to an infant through breast milk, nursing mothers should not use phentermine. Lactating women who are taking phentermine should talk to their doctor before they begin breast feeding.