Phentermine is a prescription medicine that is primarily prescribed to aid in weight loss in conjunction with diet and exercise, although it can be prescribed for other uses. It comes in the form of tablets or in time-release capsules. According to the National Center for Biotechnology Information, phentermine is usually either taken once in the morning or three times daily. The typical length of time that phentermine is taken is three to six weeks. The specific length of time is dependent on how the patient responds to the drug. To decrease the potential for side effects, phentermine should be taken with meals.
Heart Rate and Blood Pressure
According to the Mayo Clinic, phentermine increases blood pressure and raises the heart rate. Partially because of these effects, patients need to inform their physicians of any medical conditions prior to being prescribed phentermine. Conditions that the physician should know about include any heart condition, diabetes, glaucoma, high blood pressure or an overactive thyroid.
Mouth Effects
Phentermine can also cause an unpleasant taste in the mouth, and the mouth can become dry. A dry mouth typically results from a lessened production of saliva and can lead to dry and cracked lips. Note that the risk of developing dry and cracked lips can be reduced with the use of lip balm.
Digestion Effects
Phentermine can cause diarrhea or constipation as a side effect. Also, vomiting could result from taking the medication phentermine.
Drowsiness
The drug phentermine can cause drowsiness. Drinking alcohol when taking phentermine can increase the extent of the drowsiness.
Serious Side Effects
The National Center for Biotechnology Information lists a number of serious side effects that could result from taking phentermine and advised that a physician be contacted immediately should one of these side effects is experienced. These serious side effects include heart palpitations, restlessness and dizziness. Other serious side effects include tremors, chest pains, shortness of breath and insomnia. Swelling of the legs and ankles is another potential side effect of phentermine and is considered serious. Call a doctor immediately if you have difficulty performing exercises that had not been difficult before taking the drug.
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