Adipex-P (phentermine) is a stimulant that is similar to an amphetamine. Adipex-P is an appetite suppressant that affects the central nervous system.
Adipex-P is used together with diet and exercise to treat obesity (overweight) in people with risk factors such as high blood pressure, high cholesterol, or diabetes.
Do not use Adipex-P if you have used an MAO inhibitor such as furazolidone (Furoxone), isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam, Zelapar), or tranylcypromine (Parnate) in the last 14 days. A dangerous drug interaction could occur, leading to serious side effects.
Taking Adipex-P together with other diet medications such as fenfluramine (Phen-Fen) or dexfenfluramine (Redux) can cause a rare fatal lung disorder called pulmonary hypertension.
Do not take Adipex-P with any other diet medications without your doctor’s advice.
Adipex-P may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Drinking alcohol can increase certain side effects of this medicine.
Weight loss during pregnancy can harm an unborn baby, even if you are overweight. Do not use Adipex-P if you are pregnant.
Adipex-P is only part of a complete program of treatment that may also include diet, exercise, and weight control. Follow your diet, medication, and exercise routines very closely.
Adipex-P may be habit-forming and should be used only by the person it was prescribed for. Never share Adipex-P with another person, especially someone with a history of drug abuse or addiction. Keep track of the amount of medicine used from each new bottle. Adipex-P is a drug of abuse and you should be aware if anyone is using your medicine improperly or without a prescription. Do not stop using Adipex-P suddenly, or you could have unpleasant withdrawal symptoms. Ask your doctor how to avoid withdrawal symptoms when you stop using this medicine.
Get emergency medical help if you have any of these signs of an allergic reaction to Adipex-P: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have a serious side effect such as:
- feeling short of breath, even with mild exertion;
- chest pain, feeling like you might pass out;
- swelling in your ankles or feet;
- pounding heartbeats or fluttering in your chest;
- confusion or irritability, unusual thoughts or behavior;
- feelings of extreme happiness or sadness; or
- dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, chest pain, shortness of breath, uneven heartbeats, seizure).
Less serious Adipex-P side effects may include:
- feeling restless or hyperactive;
- headache, dizziness, tremors;
- sleep problems (insomnia);
- dry mouth or an unpleasant taste in your mouth;
- diarrhea or constipation, upset stomach; or
- increased or decreased interest in sex, impotence.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.