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Tablets: 250 milligrams,
Tablets: 500 milligrams,
Tablets: 750 milligrams;
Capsule: 375 milligrams;
Cream: 0.75%,
Cream: 1%;
Lotion: 0.75%;
Gel: 0.75%,
Gel: 1%;
Injection: 5 milligrams/ milliliters.

No Prescription

Flagyl is prescribed to treat parasitic infections including:
- Amebic liver abscess and amebic dysentery (infection of the colon causing bloody diarrhea);
- Bacterial vaginosis;
- Carriers of trichomonas (both sexual partners) who do not have symptoms of infection;
- Giardia infections of the small intestine;
- Trichomonas vaginal infections;

Flagyl is prescribed alone or in combination with other antibiotics in treating abscesses in the liver, pelvis, abdomen and brain caused by susceptible anaerobic bacteria. Flagyl is also prescribed in treating infection of the colon caused by a bacterium called C. difficile. (Many commonly-used antibiotics can alter the type of bacteria that inhabit the colon. C. difficile is an anaerobic bacterium that can infect the colon when the normal types of bacteria in the colon are inhibited by common antibiotics. This leads to inflammation of the colon (pseudomembranous colitis) with severe diarrhea and abdominal pain.)
Flagyl also is prescribed in combination with other drugs to treat Helicobacter pylori (H. pylori) that causes stomach or intestinal ulcers. Flagyl topical gel is prescribed for treating acne rosacea, and the vaginal gel is prescribed for treating bacterial vaginosis.

Flagyl is an antibacterial drug prescribed for certain vaginal and urinary tract infections in men and women; amebic dysentery and liver abscess; and infections of the abdomen, skin, bones and joints, brain, lungs, and heart caused by certain bacteria.


Flagyl may be taken orally with or without food. In the hospital, Flagyl can be administered intravenously to treat serious infections. The liver is primarily responsible for eliminating Flagyl from the body, and doses may need to be reduced in patients with liver disease and abnormal liver function.
Various Flagyl regimens are used. Some examples are listed below.
- Trichomoniasis: 2 g single dose or 1 g twice;
- Rosacea: apply topical gel 075-1% once daily;
- Pelvic inflammatory disease (PID): 500 milligrams orally twice daily for 14 days in combination with other drugs;
- Helicobacter pylori: 800-1500 milligrams orally daily for several days in combination with other drugs;
- Giardia: 250 milligrams orally three times daily for 5 days;
- Clostridium difficile infection: 250-500 milligrams orally 4 times daily or 500-750 orally 3 times daily;
- Bacterial Vaginosis: 750 milligrams (extended release tablets) once daily for 7 days One applicator-full of 075% vaginal gel once or twice daily for 5 days;
- Anaerobic infections: 75 milligrams/kg orally every 6 hours not to exceed 4 grams daily;
- Amebic liver abscess: 500-750 milligrams orally three times daily for 5-10 days;
- Amebic dysentery: 750 milligrams orally 3 times daily for 5-10 days;



One-day treatment: 2 grams of Flagyl, taken as a single dose or divided into 2 doses (1 gram each) taken in the same day.

Seven-day course of treatment: 250 mg 3 times daily for 7 consecutive days.

Acute Intestinal Amebiasis (Acute Amebic Dysentery)

The usual dose is 750 mg taken by mouth 3 times daily for 5 to 10 days.

Amebic Liver Abscess

The usual dose is 500 mg or 750 mg taken by mouth 3 times daily for 5 to 10 days.

Anaerobic Bacterial Infections

The usual adult oral dosage is 7.5 mg per 2.2 pounds of body weight every 6 hours.



The usual dose is 35 to 50 mg for each 2.2 pounds of body weight per day, divided into 3 doses taken for 10 days.

The safety and efficacy of Flagyl for any other condition in children have not been established.


Your doctor will test to see how much medication is in your blood and will adjust your dosage if necessary.

Side Effects.

Flagyl is a valuable antibiotic and is generally well tolerated with appropriate use.

Minor side effects include:
- Ametallic taste;
- Headaches;
- Loss of appetite;
- Nausea;
- Rarely a rash;

Serious side effects of Flagyl are rare. Serious side effects include seizures and damage of nerves resulting in numbness and tingling of extremities (peripheral neuropathy). Flagyl should be stopped if these symptoms appear.

Flagyl side effects that you should report to your health care professional or doctor as soon as possible:
- Vomiting;
- Upset Stomach;
- Nausea;
- Loss Of Appetite;
- Headache;
- Diarrhea;
- Constipation;
- Abdominal Cramps;
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