Adipex-P : Uses, Side Effects, Interactions & More

Why is this medication prescribed?
Adipex-P (Phentermine) is used for a limited period of time to accelerate weight loss in overweight people who exercise and follow a low calorie diet. Adipex-P belongs to a class of medications called anorectics. It works by decreasing appetite.

How should this medicine be used?
Adipex-P (Phentermine) comes in extended-release tablets and capsules. It is usually taken as a single daily dose in the morning or three times a day 30 minutes before meals. Follow the directions on your prescription label carefully and ask your doctor or pharmacist to explain any part you do not understand. Take Adipex-P exactly as directed.

Most people take Adipex-P for 3 to 6 weeks; The length of treatment depends on how you respond to the medicine. Adipex-P can be habit forming. Do not take a higher dose, take it more often, or take it for a longer period of time than your doctor tells you.

If you are taking extended-release (long-acting) tablets, do not break, chew, or crush them. There are some tablets that can be crushed and mixed with food.

Other uses for this medicine
This medicine may be prescribed for other uses. Ask your doctor or pharmacist for more information.

What special precautions should I follow?

Before taking Adipex-P,

  • Tell your doctor and pharmacist if you are allergic to Adipex-P, any other medications, or any of the ingredients in Adipex-P tablets. Ask your pharmacist for a list of the ingredients.
  • Tell your doctor and pharmacist what prescription and over-the-counter medications, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: fluoxetine (Prozac), fluvoxamine (Luvox), guanetidine, insulin medications for weight loss and depression, paroxetine (Paxil), and sertraline (Zoloft). Also tell your doctor if you are taking monoamine oxidase (MAO) inhibitors such as isocarboxazide (Marplan), phenelzine (Nardil), selegiline (Eldepryl, Emsam, Zelapar), and tranylcypromine (Parnate), or if you have stopped taking one of these medications. in the last 2 weeks Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
  • Tell your doctor if you have or have ever had heart disease, high blood pressure, arteriosclerosis (narrowing of the arteries), hyperthyroidism (overactive thyroid gland), diabetes, glaucoma, or a history of drug abuse.
  • Tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking Adipex-P, call your doctor.
  • Talk to your doctor about the risks and benefits of taking Adipex-P if you are 65 years of age or older. Older adults generally should not take Adipex-P because it is not as safe as other medications that can be used to treat the same condition.
  • You should know that this medicine can cause drowsiness. Do not drive a car or operate machinery until you know how this medicine affects you.
  • Ask your doctor about the safe use of alcohol while taking Adipex-P. Alcohol can worsen the side effects of Adipex-P.
  • If you have diabetes, you may need to lower your insulin dose while taking Adipex-P. Call your doctor if you have questions or problems.

What special dietary instructions should I follow?
Follow the diet and exercise program your doctor has given you. Adipex-P works best in combination with a diet program.

What should I do if I forget a dose?
Take the missed dose as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can this medication cause?

Adipex-P may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

  • dry mouth
  • unpleasant taste
  • diarrhea
  • constipation
  • vomiting

Some side effects can be serious. If you experience any of the following symptoms, call your doctor immediately:

  • increased blood pressure
  • heart palpitations
  • restlessness
  • dizziness
  • tremor
  • insomnia
  • shortness of breath
  • chest pain
  • swelling of the legs and ankles
  • difficulty doing exercise that you have been able to do

Adipex-P may cause other side effects. Call your doctor if you have any unusual problems during your Adipex-P treatment.

If you experience a serious side effect, you or your doctor can submit an online report to the Food and Drug Administration (FDA) MedWatch Adverse Event Reporting Program ( or by phone (1-800-332-1088).

What should I know about storage and disposal of this medication?
Keep this medicine in its container, tightly closed and out of the reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).

Unnecessary medications must be disposed of in a special way to ensure that pets, children and others cannot consume them. However, you should not flush this medicine down the toilet. Instead, the best way to get rid of your medication is through a medication take-back program. Talk to your pharmacist or contact your local garbage / recycling department for information on return programs in your community. Consult the FDA’s Safe Drug Disposal website ( for more information if you do not have access to a take-back program.

It is important to keep all medications out of the sight and reach of children, as many containers (such as those for taking pills weekly and those used for eye drops, creams, patches, and inhalers) are not resistant to children and children. young children can easily open them. To protect young children from poisoning, always close the safety caps and immediately put the medicine in a safe place, one that is above and out of your sight and reach.

In case of emergency/overdose
In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at If the victim collapsed, had a seizure, is having trouble breathing, or cannot wake up, call 911 immediately.

What other information should I know?
Keep all appointments with your doctor and the laboratory. Your doctor will order certain laboratory tests to verify your response to Adipex-P.

Do not let anyone else take your medicine. Phenteramine is a controlled substance. Recipes can be replenished only a limited number of times; ask your pharmacist any questions you have about refilling your prescription.

It is important to keep a written list of all prescription and over-the-counter (non-prescription) medications you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should carry this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.

Brand Names

  • Adipex-P
  • Ionamin

Disclaimer: We have made every effort to ensure that all information is factually accurate, comprehensive and up-to-date. However, this article should not be used as a licensed health care professional’s choice of knowledge and expertise. You should always consult your doctor or other health care professional before taking any medication. The information given here is subject to change and it has not been used to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions or adverse effects. The lack of warning or other information for any drug does not indicate that the combination of medicine or medication is safe, effective or appropriate for all patients or all specific uses.

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