Metronidazole is an antibiotic. It fights bacteria in your body.

Metronidazole is used to treat bacterial infections of the vagina, stomach, skin, joints, and respiratory tract. This medication will not treat a vaginal yeast infection.

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  • Flagyl, Flagyl 375, Flagyl ER, Flagyl I.V. RTU, Metro I.V., Protostat, Flagyl I.V., Metryl
  • More common
    Agitation
    back pain
    blindness
    blurred vision
    burning, numbness, tingling, or painful sensations in the hands or feet
    changes in speech patterns
    confusion
    convulsions
    decreased vision
    depression
    dizziness
    drowsiness
    eye pain
    fever
    hallucinations
    headache
    irritability
    lack of coordination
    nausea
    seizures
    shakiness and unsteady walk
    slurred speech
    stiff neck or back
    trouble speaking
    unsteadiness, trembling, or other problems with muscle control or coordination
    unusual tiredness or weakness
    vomiting
    weakness in the arms, hands, legs, or feet
    Less common
    Black, tarry stools
    blood in the urine or stools
    body aches or pain
    chills
    clumsiness or unsteadiness
    difficulty with breathing
    ear congestion
    feeling of pelvic pressure
    frequent or painful urination
    loss of voice
    nasal congestion
    pinpoint red spots on the skin
    runny nose
    skin rash, hives, redness, or itching
    sneezing
    stomach and back pain (severe)
    unusual bleeding or bruising
    vaginal irritation, discharge, or dryness not present before taking the medicine
    Rare
    Bleeding gums
    bloating
    chest pain
    constipation
    cough
    dark-colored urine
    fast heartbeat
    indigestion
    loss of appetite
    painful or difficult urination
    pains in the stomach, side, or abdomen, possibly radiating to the back
    sore throat
    sores, ulcers, or white spots on the lips or in the mouth
    swollen glands
    yellow eyes or skin
    Incidence not known
    Blistering, peeling, or loosening of the skin
    bloody or cloudy urine
    burning while urinating
    continuing diarrhea
    continuing stomach pain
    diarrhea
    feeling of warmth
    increased volume of pale, dilute urine
    joint or muscle pain
    loss of bladder control
    red skin lesions, often with a purple center
    red, irritated eyes
    redness of the face, neck, arms, and occasionally, upper chest
    redness of the skin
    Some of the side effects that can occur with metronidazole 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
    Abdominal or stomach cramps
    dizziness or lightheadedness
    feeling of constant movement of self or surroundings
    heartburn
    sensation of spinning
    trouble sleeping
    weight loss
    Less common or rare
    Change in taste sensation
    congestion
    dry mouth
    pain or tenderness around the eyes and cheekbones
    tender, swollen glands in the neck
    trouble with swallowing
    unpleasant or sharp metallic taste
    voice changes
    Incidence not known
    Decreased interest in sexual intercourse
    inability to have or keep an erection
    loss in sexual ability, desire, drive, or performance
    painful sexual intercourse
  • (oral tablet, oral capsule, oral tablet, extended release, intravenous solution, intravenous powder for injection, compounding powder)
  • Bacterial Infection

    Treating certain bacterial infections. It may be used in combination with other medicines to treat acne or certain amoeba infections. It may be used to prevent certain types of malaria in travelers who will be visiting malaria-infected areas for less than 4 months. It may also be used to prevent or slow the progression of anthrax after exposure. Doryx delayed-release capsules are a tetracycline antibiotic. It works by slowing the growth of bacteria. Slowing the bacteria's growth allows the body's immune system to destroy the bacteria.