Mefloquine is a medicine used to treat malaria, a disease caused by parasites. This medicine 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.

Mefloquine is also used to prevent malaria.

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  • Lariam
  • Rare
    Aching joints and muscles
    anxiety
    blistering, loosening, peeling, or redness of the skin
    chest pain or discomfort
    chills
    confusion
    convulsions (seizures)
    cough or hoarseness
    dizziness
    fainting
    fever
    hallucinations (seeing, hearing, or feeling things that are not there)
    irregular, pounding, slow, or fast heartbeat or pulse
    irritability
    lightheadedness
    lower back or side pain
    mental depression
    painful or difficult urination
    pinpoint red spots on the skin
    red or irritated eye
    restlessness
    sore throat
    sores, ulcers, or white spots in the mouth or on the lips
    stiff neck
    swelling of the ankles, feet, or lower legs
    unusual bleeding or bruising
    unusual tiredness or weakness
    vomiting
    Incidence not known
    Blurred or loss of vision
    continuing ringing or buzzing or other unexplained noise in the ears
    disturbed color perception
    double vision
    feeling of constant movement of self or surroundings
    halos around lights
    hearing loss
    hearing problems
    loss of balance
    loss of bladder control
    muscle spasm or jerking of all extremities
    night blindness
    overbright appearance of lights
    sensation of spinning
    severe or continuing headache
    sudden loss of consciousness
    trouble sleeping
    troubled breathing
    tunnel vision
    Some of the side effects that can occur with mefloquine may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

    More common
    Diarrhea
    emotional problems
    nausea
    stomach pain
    Less common
    Abnormal dreams
    loss of appetite
    skin rash
    Rare
    Loss of hair
    Incidence not known
    Acid or sour stomach
    belching
    flushing or redness of the skin
    heartburn
    indigestion
    skin rash with a general disease
    stomach discomfort, upset, or pain
    swelling
    unusually warm skin
  • (oral tablet)