Phentermine is a prescription weight loss medication. The brand names for phentermine are Ionamin and Adipex-P. Phentermine is a central nervous system stimulant that aids in weight loss by suppressing the appetite. A common side effect of phentermine, which is similar in action to amphetamines, is increased energy. Many dieters appreciate this side effect because it makes it easier for the dieter to maintain an exercise program. Other side effects of phentermine are not as welcome.
Mild Side Effects
Anyone taking phentermine may experience some mild side effects. Talk to your doctor if the side effects are troublesome or don't resolve after a few days on the medication. Mild side effects that you might develop after taking phentermine are a dry mouth or a metallic or otherwise unpleasant taste in the mouth, constipation, anxiety or nervousness, a headache and trouble sleeping. Some people also develop diarrhea or unusual itching while taking phentermine. Many of the minor side effects of phentermine, such as dry mouth, headache and diarrhea, can be resolved by staying well-hydrated. When you begin taking the phentermine, take it first thing in the morning to reduce the risk of sleep problems. After you know how phentermine will affect you, you may find that you can take it a little later in the morning to help stave off after dinner-hunger pangs.
Severe Side Effects
People who develop more serious side effects while taking phentermine should stop taking the medication and consult their doctor. Side effects that are more serious include developing a shortness of breath, even while completing a task that doesn't require much effort; swelling or dramatic weight gain; problems with the chest, including an uneven heartbeat; pain; or feeling like you may pass out. Finally, watch for signs of high blood pressure, including a severe headache, blurry vision, confusion, shortness of breath, uneven heartbeat, pain in the chest or seizures.
Contraindications
Many people should not take phentermine. They include people with existing cases of high blood pressure, heart disease or hardening of the arteries, people with glaucoma, certain thyroid conditions or those who are currently on antidepressants. People who experience anxiety or manic phases should carefully consider taking this medication, since the stimulant effect could exasperate those conditions. It is possible to develop an addiction to phentermine, so it is important for people who take this medication to use it responsibly. People with a prior history of drug or alcohol problems should not take phentermine. Anyone who is pregnant, trying to become pregnant or nursing a baby should also refrain from taking phentermine.
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