What is Flagyl used for?


Flagyl tablets contain 250 mg or 500 mg of metronidazole.
Metronidazole is an antibiotic effective against bacterial infections (vagina, stomatch, skin, joints, liver and respiratory tract) and certain parasites.

Giardia lamblia and ameba are intestinal parasites that cause diarrhea and abdominal pain.

Trichomonas is a vaginal parasite that causes vaginitis.
Metronidazole selectively blocks some functions within the bacterial cells and the parasites resulting in their death.


Take this medicine for the full length of time prescribed. Do not skip doses. It may increase your risk of antibiotics-resistant infection. Metronidazole will not treat viral infections.
Flagyl and alcohol: do not take alcohol while you are using metronidazole and for at least 3 days after your treatment. You may have side effects such as fast heartbeats, tingly feeling and vomiting.
Metronidazole should not used in early pregnancy because of potential adverse effects on the fetus.
Metronidazole is excreted in breast milk. Nursing mothers, because of potential adverse effects on the newborn, should not use metronidazole.

Flagyl is available in
Tablets: 250 and 500 mg, extended release: 750 mg.
Capsule: 375 mg. Cream: 0.75% and 1%.
Lotion: 0.75%.
Gel: 0.75% and 1%.
Injection: 5 mg/ml

Flagyl Side Effects

See your doctor immediately, if you have any of these allergies: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop the medication and contact your doctor at once if you have any of these serious side effects:
White patches or sores inside your mouth or on your lips
Pain or burning sensation when urinating
Bloody/watery diarrhea
Pain behind your eyes
Damage of nerves resulting in numbness and tingling of extremities (hands/feet)
Peripheral neuropathy (damage to or disease affecting nerves, which may impair sensation, movement, gland or organ function, or other aspects of health, depending on the type of nerve affected).
Encephalopathy (disorder or disease of the brain. It is a syndrome of overall brain dysfunction; this syndrome can have many different organic and inorganic causes.)
Sterile meningitis (a condition in which the layers lining the brain, meninges, become inflamed)
Minor side effects may include:
stomach pain
lightheadedness, loss of balance
Vaginal discharge or itching
Dry mouth or unpleasant metallic taste
Cough, sneezing, runny or stuffy nose
Swollen or sore tongue/ loss of appetite

Flagyl Dosage

Take exactly as prescribed by your specialist. Do not take it longer than recommended or in quantities other than as prescribed.
Take the extended-release tablet (Flagyl ER) on an empty stomach, at least an hour before eating or 2 hours after meal.
Do not break or chew Flagyl ER; Swallow it whole. Crushing the tablet may cause too much to be released at one time.
Skipping doses may increase your risk of further infection that is resistant to antibiotics. Metronidazole will not treat a viral infection such as the common cold or flu.
To be sure this medication is not causing you harmful effects; your blood may need to be tested often. Your liver function may also need to be tested. Visit your doctor regularly.
Metronidazole may be taken orally with or without food. In the hospital, metronidazole can be administered intravenously to combat serious infections. The liver is responsible for eliminating metronidazole from the body, and doses may be reduced in patients with liver disease and abnormal liver function.

Some examples of metronidazole dosage are:
Amebic dysentery: 750 mg orally 3 times daily for 5 -10 days
Amebic liver abscess: flagyl 500 -750 mg orally three times daily for 5 -10 days
Anaerobic infections: 7.5 mg/kg orally or by injection every 6 hours for 7 to 10 days not to exceed 4 grams daily.
Bacterial vaginosis: 750 mg (extended release tablets) once daily for 7 days or 500 mg twice daily for 7 days or 2 grams single dose or one applicator-full of 0.75% vaginal gel, once or twice daily for 5 days.
Clostridium difficile infection: 250 -500 mg orally 4 times daily or 500 -750 mg orally 3 times daily
Giardia: 250 mg orally three times daily for 5 days
Helicobacter pylori: 800 -1500 mg orally daily for several days in combination with other drugs.
Pelvic inflammatory disease (PID): 500 mg orally twice daily for 14 days in combination with other drugs.
Trichomoniasis: 2 grams single dose or 1 gram twice
Rosacea: apply topical gel 0.75 -1% once daily


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