Prevacid (lansoprazole) belongs to a group of drugs called proton pump inhibitors. It decreases the amount of acid produced in the stomach.

Prevacid is used to treat and prevent stomach and intestinal ulcers, erosive esophagitis (damage to the esophagus from stomach acid), and other conditions involving excessive stomach acid such as Zollinger-Ellison syndrome.

Over-the-counter Prevacid OTC is used to treat frequent heartburn that happens 2 or more days per week.

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  • FIRST Lansoprazole, Prevacid, Prevacid OTC, Prevacid SoluTab, Prevacid I.V.
  • More common
    Diarrhea
    skin rash or itching
    Less common
    Abdominal or stomach pain
    increased or decreased appetite
    joint pain
    nausea
    vomiting
    Rare
    Anxiety
    cold or flu-like symptoms
    constipation
    increased cough
    mental depression
    muscle pain
    rectal bleeding
    unusual bleeding or bruising
    Incidence not known
    Abdominal or stomach tenderness
    back or leg pains
    bleeding gums
    blistering, peeling, or loosening of the skin
    bloating
    bloody, black, or tarry stools
    change in mental status
    chest pain
    chills
    clay colored stools
    cough or hoarseness
    dark or bloody urine
    difficulty with swallowing
    drowsiness
    fast heartbeat
    fever
    general body swelling
    high fever
    hives
    indigestion
    loss of appetite
    lower back or side pain
    mood or mental changes
    muscle spasms (tetany) or twitching seizures
    nosebleeds
    painful or difficult urination
    pains in the stomach, side, or abdomen, possibly radiating to the back
    pale skin
    pinpoint red spots on the skin
    puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
    red, irritated eyes
    red skin lesions, often with a purple center
    seizures
    sore throat
    sores, ulcers, or white spots on the lips or in the mouth
    swelling of the feet or lower legs
    swollen or painful glands
    tightness in the chest
    trembling
    unusual tiredness or weakness
    yellow eyes or skin
    Some lansoprazole side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

    More common
    Dizziness
    headache
    Less common
    Bleeding, blistering, burning, coldness, or discoloration of the skin
    mild nausea
    Rare
    Acid or sour stomach
    bad, unusual or unpleasant (after) taste
    belching
    burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
    change in taste
    feeling faint, dizzy, or lightheaded
    feeling of heat or warmth
    flushing or redness of the skin, especially on the face and neck
    mild diarrhea
    mild headache
    mild vomiting
    stomach discomfort or upset
    sweating
    Incidence not known
    Decrease in passing urine (dribbling)
    decrease in the frequency of urination
    decrease in urine volume
    difficulty with speaking
  • (lansoprazole) capsule, delayed release, tablet, orally disintegrating, delayed release