Methamphetamine (By mouth)


Methamphetamine (meth-am-FET-a-meen)

Treats attention-deficit/hyperactivity disorder (ADHD) and helps with weight loss in obese patients.

Brand Name(s)


When This Medicine Should Not Be Used

How to Use This Medicine

Tablet, Long Acting Tablet

  • Take your medicine as directed. Your dose may need to be changed several times to find what works best for you.
  • Do not take this medicine late at night. It may cause trouble sleeping.
  • Weight loss treatment: Take 30 minutes before each meal.
  • This medicine should come with a Medication Guide. Ask your pharmacist for a copy if you do not have one.
  • Missed dose:Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.
  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

Drugs and Foods to Avoid

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Do not use this medicine if you have used an MAO inhibitor (MAOI) in the past 14 days.
  • Some foods and medicine can affect how methamphetamine works. Tell your doctor if you are also using
    • Guanethidine
    • Insulin
    • Blood pressure medicine
    • Medicine for depression
    • Phenothiazine medicine (such as chlorpromazine, perphenazine, promethazine, prochlorperazine, thioridazine)

Warnings While Using This Medicine

  • Tell your doctor if you are pregnant or breastfeeding, or if you have heart or blood vessel problems, including high blood pressure, heart rhythm problems, heart failure, or a history of heart attack or stroke. Tell your doctor if you have a history of depression, bipolar disorder, or mental illness. Tell your doctor if you have glaucoma, overactive thyroid, Tourette syndrome, or a history of seizures or drug abuse.
  • This medicine may cause the following problems:
    • Sudden death in people who already have problems with the structure of their hearts
    • Heart or blood vessel problems, including heart attack and stroke
    • Changes in behavior or unusual thoughts
    • Slow growth in children
    • Blood circulation problem in the fingers or toes, such as Raynaud phenomenon
    • Vision changes
  • This medicine may make you dizzy or drowsy. Do not drive or do anything else that could be dangerous until you know how this medicine affects you.
  • This medicine can be habit-forming. Do not use more than your prescribed dose. Call your doctor if you think your medicine is not working.
  • Weight loss treatment: This medicine often stops working after you have been taking it for a few weeks. Do not take more than your doctor has prescribed, even if this happens. This medicine is only for short-term use.
  • Tell any doctor or dentist who treats you that you are using this medicine. This medicine may affect certain medical test results.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Possible Side Effects While Using This Medicine

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Blurred vision, changes in vision
  • Chest pain, trouble breathing, or fainting
  • Extreme energy, mood or mental changes, confusion, agitation, restlessness, trouble sleeping, unusual thoughts or behavior
  • Fast, pounding, or uneven heartbeat
  • Numbness or weakness in your arm or leg, or on one side of your body
  • Seeing, hearing, or feeling things that are not there
  • Seizures
  • Sores, coldness, numbness, or color changes on your fingers or toes

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088

Version Info

  • Last reviewed on 7/4/2015

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