Generic Name: Methamphetamine Brand Name(s): Generics only. No brands available.


What is methamphetamine used for?

Methamphetamine is commonly used for treating attention deficit hyperactivity disorder (ADHD). It works by changing the amounts of certain natural substances in the brain.

Methamphetamine is a central nervous system stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control.

Methamphetamine is also used along with a doctor-approved, reduced-calorie diet as an aid to help significantly overweight people lose weight. This use of methamphetamine should only be applied in a few weeks in patients who have not lost enough weight with other treatments (for example, dieting, other drugs, group programs). It may work by decreasing your appetite.

How should I take methamphetamine?

Take methamphetamine exactly as it was prescribed for you. Using this medicine improperly can cause death or serious side effects on the heart.

Methamphetamine is a drug of abuse and may be addictive, especially with long-term use for weight loss. Therefore, you should not take this medicine for longer than recommended.

For ADHD, take methamphetamine by mouth with or without food.

For weight loss, take this medication by mouth, and it should be used only after other diets or medications have been tried without successful weight loss.

Do not use methamphetamine late in the evening because it may cause you to have trouble sleeping.

How do I store methamphetamine?

Methamphetamine is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store methamphetamine in the bathroom or the freezer. There may be different brands of methamphetamine that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.

You should not flush methamphetamine down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Precautions & warnings

What should I know before using methamphetamine?

Before using this drug, tell your doctor if:

  • You are pregnant or breastfeeding. This is because, while you are expecting or feeding a baby, you should only take medicines on the recommendation of a doctor.
  • You are taking any other medicines. This includes any medicines you are taking which are available to buy without a prescription, such as herbal and complementary medicines.
  • You have allergy with any of active or inactive ingredients of methamphetamine or other medications.
  • You have any other illnesses, disorders, or medical conditions.

You should not use this medicine if you have glaucoma, overactive thyroid, severe agitation, moderate to severe high blood pressure, heart disease or coronary artery disease, or a history of drug or alcohol addiction.

Do not use methamphetamine if you have taken an MAO inhibitor in the past 14 days, including isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others.

Some stimulants have caused sudden death in certain people. Tell your doctor if you have:

  • Heart problems or a congenital heart defect
  • High blood pressure
  • A family history of heart disease or sudden death

When used to treat obesity, methamphetamine should be used only after other diets or medications have been tried without successful weight loss.

Is it safe during pregnancy or breastfeeding?

There are no adequate studies in women for determining risk when using this medication during pregnancy or while breastfeeding. Please always consult with your doctor to weigh the potential benefits and risks before taking this medication. This medication is pregnancy risk category C, according to the US Food and Drug Administration (FDA).

FDA pregnancy risk category reference below:

  • A=No risk
  • B=No risk in some studies
  • C=There may be some risk
  • D=Positive evidence of risk
  • X=Contraindicated
  • N=Unknown

Side effects

What side effects can occur from methamphetamine?

Get emergency medical help if you have signs of an allergic reaction to methamphetamine: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Methamphetamine can affect growth in children. Tell your doctor if your child is not growing at a normal rate while using this medicine.

Stop using this medicine and call your doctor at once if you have:

  • Chest pain, trouble breathing, feeling like you might pass out
  • Hallucinations (seeing or hearing things that are not real), new behavior problems, aggression, hostility, paranoia
  • A seizure (convulsions)
  • Numbness, pain, cold feeling, unexplained wounds, or skin color changes (pale, red, or blue appearance) in your fingers or toes
  • Muscle twitches (tics)
  • Changes in your vision
  • Unexplained muscle pain, tenderness, or weakness (especially if you also have fever, unusual tiredness, and dark colored urine)

Common side effects may include:

  • Headache or dizziness
  • Fast heartbeats
  • Sleep problems (insomnia)
  • Dry mouth, upset stomach
  • Tremors
  • Loss of appetite, weight loss

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.


What drugs may interact with methamphetamine?

Methamphetamine may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Drugs that may affect methamphetamine:

  • Medication to treat depression or mental illness
  • Insulin
  • Blood pressure medication
  • Seizure medication

Does food or alcohol interact with methamphetamine?

Methamphetamine may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with methamphetamine?

Methamphetamine may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.

Health conditions that may interact with this drug are:

  • Cardiovascular
  • Glaucoma
  • Agitation
  • Cardiac Disease
  • Glaucoma
  • Hypertension
  • Liver Disease
  • Seizure Disorders
  • Substance Abuse
  • Psychiatric Disorders
  • Renal Dysfunction
  • Tics
  • Diabetics


The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using this medication.

What is the dose of methamphetamine for an adult?

For Obesity

For short-term use in Exogenous Obesity: One 5 mg tablet should be taken one-half hour before each meal. Treatment should not exceed a few weeks in duration.

What is the dose of methamphetamine for a child?

For Attention Deficit Disorder

Age 6 years and older:

Initial Dose: 5 mg once or twice a day is recommended.

Daily dosage may be raised in increments of 5 mg at weekly intervals until an optimum clinical response is achieved. The usual effective dose is 20 to 25 mg daily.

The total daily dose may be given in two divided doses daily.

Drug administration should be interrupted occasionally to determine if there is a recurrence of behavioral symptoms sufficient to require continued therapy.

For Obesity

Age 12 Years and Older:

5 mg orally 30 minutes before each meal

Duration of Therapy: Should not exceed a few weeks

How is methamphetamine available?

Methamphetamine is available in the following dosage forms and strengths:

  • Methamphetamine (oral tablet, extended release): 5 mg; 10 mg; 15 mg

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of methamphetamine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.

Hello Health Group does not provide medical advice, diagnosis or treatment.

Review Date: August 1, 2017 | Last Modified: September 2, 2017

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