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Lariam An antimalarial drug that acts on the erythrocyte forms of the pathogens of human malaria. It is effective against pathogens of malaria, resistant to other antimalarial drugs (chloroquine, proguanil, pyrimethamine, combination of pyrimethamine with sulfonamides).

Active Ingredient: mefloquine hydrochloride

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Analogs of Lariam:
Bupron Sr, Naltrexone, Dutas
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Lariam, 250mg

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Product Description


Lariam (Mefloquine Hydrochloride)


What is Lariam?

Lariam is a medicine used to treat malaria, a disease caused by parasites. Lariam works by interfering with the growth of parasites in the red blood cells of the human body.

Parasites that cause malaria typically enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America, and Southern Asia.

Lariam is also used to prevent malaria.

Lariam may also be used for purposes not listed in this medication guide.

Important Information

Some people taking Lariam have had sudden serious psychiatric or nerve problems, some of which lasted long after they stopped taking this medicine. These side effects can be permanent.

Stop taking Lariam and call your doctor right away if have any of these side effects: headache, ringing in your ears, dizziness, loss of balance, problems with coordination, anxiety, depression, paranoia, hallucinations, or thoughts about suicide or hurting yourself.

You should not take Lariam to prevent malaria if you have a recent history of depression, an anxiety disorder, seizures, mental illness (such as schizophrenia), or psychosis.

Before taking this medicine

Some people taking Lariam have had sudden serious psychiatric or nerve problems. Some of these effects have lasted for months to years after this medicine treatment ended, and these side effects can be permanent. Talk to your doctor if you have concerns about taking this medicine.

You should not use this medication if you are allergic to Lariam or similar medications such as quinine or quinidine.

You also should not use Lariam to prevent malaria if you have a recent history of:

  • depression;

  • an anxiety disorder;

  • seizures; or

  • mental illness (such as schizophrenia) or psychosis.

However, your doctor may prescribe Lariam to treat malaria even if you do have any of the conditions listed above.

To make sure Lariam is safe for you, tell your doctor if you have:

FDA pregnancy category B. It is not known whether Lariam will harm an unborn baby. Tell your doctor if you are pregnant or if you become pregnant while using this medication. Use effective birth control while you are using this medication and for at least 3 months after your treatment ends.

Mefloquine can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

Lariam should not be used to treat malaria in a child younger than 6 months without a doctor's advice. This medicine should not be used to prevent malaria in a child who weighs less than 44 pounds.

How should I take Lariam?

Follow all directions on your prescription label. Do not take Lariam in larger or smaller amounts or for longer than recommended.

It is important to use this medication regularly (before, during and after travel) to best prevent malaria. If you stop using the medication early for any reason, talk to your doctor about other forms of malaria prevention.

Take Lariam just after your main meal.

Take this medicine with a full glass (8 ounces) of water.

If you have trouble swallowing the Lariam tablet, you may crush the tablet and mix it into a small glass of milk, water, or other beverage to make swallowing easier.

If you vomit within 30 minutes after taking Lariam, take another full dose. If you vomit 30 to 60 minutes after taking the medicine, take another half dose. If your vomiting continues, call your doctor.

If you are taking this medicine to prevent malaria:

  • Lariam is usually taken once per week to prevent malaria.

  • Start taking the medicine 1 to 3 weeks before entering an area where malaria is common. Continue taking the medicine once weekly during your stay and for at least 4 weeks after you leave the area.

  • Take your weekly dose on the same day each week.

  • If you stop taking the medicine early for any reason, contact a healthcare professional about another form of malaria prevention.

If you are taking Lariam to treat malaria:

  • Take as directed by your doctor.

In addition to taking Lariam, use protective clothing, insect repellents, and mosquito netting around your bed to further prevent mosquito bites that could cause malaria.

If you use this medication long-term, you may need frequent blood tests to check your liver function. Your vision may also need to be checked.

Contact your doctor as soon as possible if you have been exposed to malaria, or if you have fever or other symptoms of illness during or after a stay in an area where malaria is common.

No medication is 100% effective in treating or preventing malaria. For best results, keep using the medication as directed. Talk with your doctor if you have fever, vomiting, or diarrhea during your treatment.

Store at room temperature away from moisture and heat.

What happens if I miss a dose?

Since Lariam is often used as a single dose, you may not be on a dosing schedule. If you are on a weekly schedule, use the missed dose as soon as you remember. Then take the next dose on your next usual dosing day. Do not use extra medicine to make up the missed dose.

Call your doctor for instructions if you forget to take the medicine within 1 week before your travel.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid while taking Lariam?

Do not take halofantrine or ketoconazole while you are taking Lariam and for at least 15 weeks after you stop taking it. Serious, life-threatening side effects on your heart can occur if you take halofantrine before the this medicine has cleared from your body.

Avoid taking chloroquine, quinine, or quinidine while you are taking Lariam.

Lariam can cause side effects that may impair your thinking or reactions. Be careful if you drive, operate machinery, pilot an airplane, scuba dive, or do anything that requires you to be awake and alert.

Lariam side effects

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

Stop taking Lariam and call your doctor right away if you any of these side effects:

  • sudden headache, ringing in your ears, dizziness, loss of balance, or problems with coordination;

  • severe anxiety, depression;

  • paranoia, hallucinations (seeing or hearing things that are not real);

  • confusion, unusual behavior; or

  • thoughts about suicide or hurting yourself.

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

  • a light-headed feeling, like you might pass out;

  • seizure (convulsions);

  • increased blood pressure--severe headache, blurred vision, chest pain, shortness of breath, uneven heartbeats; or

  • liver problems--nausea, upper stomach pain, itching, tired feeling, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Common side effects may include:

  • stomach pain, vomiting, diarrhea;

  • dizziness;

  • muscle pain;

  • fever, chills; or

  • mild skin rash.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect Lariam?

Many drugs can interact with Lariam. Not all possible interactions are listed here. Tell your doctor about all your medications and any you start or stop using during treatment with this medicine, especially:

  • heart or blood pressure medication;

  • medicine to treat depression or mental illness;

  • seizure medication;

  • tuberculosis medication; or

  • a "live" vaccine such as measles, mumps, and rubella (MMR).

This list is not complete and many other drugs can interact with Lariam. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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