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Appetite Suppressants (Sympathomimetics) for Obesity

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Appetite Suppressants (Sympathomimetics) for Obesity


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How It Works

Sympathomimetic appetite suppressants make you feel less hungry. They work by changing levels of brain chemicals (neurotransmitters) that affect mood and appetite. This medicine tends to work for only a few weeks, so it is not recommended for long–term use. Doctors usually have patients use the medicine for no more than 12 weeks. That is why it is important to learn healthy habits for eating and getting more active.

Why It Is Used

Appetite suppressant medicines help people who are obese (those with a body mass index [BMI] of 30 or higher) to lose weight. It may also be prescribed for people who have BMIs of 27 or higher when they have other health conditions (such as diabetes, high blood pressure, or high cholesterol) that are made worse by being overweight.

How Well It Works

These medicines work to decrease your appetite for only a few weeks. They are not meant for long-term use. If you think they are not working, do not take more than the dosage prescribed. Talk to your doctor. Taking too much of this medicine can cause side effects and may lead to a habit.

A review of research reports that using phentermine may result in more weight loss than when taking a placebo. Most of the people using phentermine also made lifestyle changes, such as diet or exercise.1

Side Effects

All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.

Here are some important things to think about:

Call 911 or other emergency services right away if you have:

Call your doctor if you have:

Common side effects of this medicine include:

See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

What To Think About

To help prevent sleeplessness, take these types of medicines at least 4 to 6 hours before you go to bed.

Taking medicine

Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.

There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.

Advice for women

If you are pregnant, breast-feeding, or planning to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.


Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.

Complete the new medication information form (PDF) to help you understand this medication.



  1. DeLaet D, Schauer D (2011). Obesity in adults, search date September 2010. BMJ Clinical Evidence. Available online:

Créditos para Appetite Suppressants (Sympathomimetics) for Obesity

By Healthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer Theresa O'Young, PharmD - Clinical Pharmacy
Last Revised April 5, 2013

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