Generic Name: Metronidazole

  • What is Flagyl?

    Flagyl is used to treat certain vaginal and urinary tract infections, intestinal and liver infections, and infections of the abdomen, blood, bones and joints, brain, lung, heart, and skin.

  • What is the most important information I should know about Flagyl?

    Like all antibiotics, Flagyl works only against bacteria. It will not cure an infection caused by a virus, such as the common cold or flu.

    Do not drink alcoholic beverages while taking Flagyl and at least 1 day after completing the full course of therapy. The combination can cause abdominal cramps, nausea, vomiting, headaches, and flushing.

  • Who should not take Flagyl?

    Do not take Flagyl if you are allergic to it or to drugs that are similar to it. Do not use Flagyl during the first 3 months of pregnancy for the treatment of trichomoniasis (a sexually transmitted genital infection).

  • What should I tell my doctor before I take the first dose of Flagyl?

    Tell your doctor about all prescription, over-the-counter, and herbal medications you are taking before beginning treatment with Flagyl. Also, talk to your doctor about your complete medical history, especially if you have a central nervous system disease, epilepsy or another seizure disorder, a fungal infection, liver disease, or blood disorder. Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What is the usual dosage?

    The information below is based on the dosage guidelines your doctor uses. Depending on your condition and medical history, your doctor may prescribe a different regimen. Do not change the dosage or stop taking your medication without your doctor's approval.

    Parasite Infections (Amebiasis)

    Adults: The usual dose is 750 milligrams (mg) taken by mouth 3 times daily for 5-10 days. Your doctor may prescribe other doses based on the site of your infection.

    Children: The usual dose is 35-50 mg per 2.2 pounds of body weight per day, divided into 3 doses, taken by mouth for 10 days.

    Bacterial Infections

    Adults: The usual oral dose is 7.5 mg per 2.2 pounds of body weight taken by mouth every 6 hours. The usual duration of therapy is 7-10 days; however, this may vary depending on what type of infection you have. For more serious infections, Flagyl will be given intravenously (through a vein).

    Trichomoniasis (Sexually Transmited Disease)

    Adult men: Your doctor will individualize your dosing regimen based on the severity of your infection and how well you respond to treatment.

    Adult women: 1-Day Treatment: 2 grams (g) given either as a single dose or in two divided doses of 1 g each taken on the same day; 7-Day Course of Treatment: 250 mg taken 3 times daily for 7 consecutive days.

  • How should I take Flagyl?

    Flagyl works best when there is a constant amount of drug in the blood. Take your doses at evenly spaced intervals and try to avoid missing any doses.

    If you are being treated for the sexually transmitted genital infection called trichomoniasis, your doctor may want to treat your partner at the same time, even if there are no symptoms. Try to avoid sexual intercourse until the infection is cured. If you do have sexual intercourse, use a condom.

    It is important to take the full dosage schedule of Flagyl, even if you're feeling better in a few days. Not completing the full dosage schedule may decrease the drug's effectiveness and increase the chances that the bacteria may become resistant to Flagyl and similar antibiotics. If this happens, Flagyl and similar antibiotics may not work in the future.

  • What should I avoid while taking Flagyl?

    Do not drink alcoholic beverages while taking Flagyl and for at least 1 day after completing the full course of therapy. Avoid taking Flagyl if you have taken disulfiram within the last 2 weeks.

  • What are possible food and drug interactions associated with Flagyl?

    If Flagyl is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is especially important to check with your doctor before combining Flagyl with any of the following: alcohol, cimetidine, disulfiram, lithium, phenobarbital, phenytoin, or warfarin.

  • What are the possible side effects of Flagyl?

    Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe for you to continue taking this drug.

    Two serious side effects that have occurred with Flagyl are seizures and numbness or tingling in the arms, legs, hands, and feet. If you experience either of these symptoms, stop taking the medication and call your doctor immediately.

    Side effects may include: abdominal cramps, constipation, unpleasant metallic taste, diarrhea, headache, loss of appetite, nausea, upset stomach, vomiting, dizziness, trouble sleeping, rash, dry mouth

  • Can I receive Flagyl if I am pregnant or breastfeeding?

    The effects of Flagyl during pregnancy and breastfeeding are unknown. Do not use Flagyl during the first 3 months of pregnancy for the treatment of trichomoniasis. Do not breastfeed while you are taking Flagyl. Tell your doctor immediately if you are pregnant, plan to become pregnant, or are breastfeeding.

  • What should I do if I miss a dose of Flagyl?

    If you miss a dose of Flagyl, take the missed dose as soon as you remember it. However, if it is almost time for your next dose, skip the one you missed and return to your regular dosing schedule. Do not take two doses at once.

  • How should I store Flagyl?

    Store below room temperature and protect from light.

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I'm Kristen Dore, PharmD. Welcome to PDR Health!

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