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Metronidazole
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Metronidazole

Generic name: metronidazole (oral/injection) [ me-troe-NI-da-zole ]
Brand names: Flagyl, Flagyl ER, Flagyl I.V., RTU, Metro I.V., Protostat, Metryl
Dosage forms: intravenous solution (500 mg/100 mL); oral capsule (375 mg); oral suspension (100 mg/mL; 50 mg/mL); oral tablet (250 mg; 500 mg); oral tablet, extended release (750 mg)
Drug classes:Amebicides, Miscellaneous antibiotics

Medically reviewed by Kaci Durbin, MD. Last updated on Oct 20, 2021.

What is metronidazole?

Metronidazole is an antibiotic that is used to treat bacterial infections of the vagina, stomach, liver, skin, joints, brain and spinal cord, lungs, heart, or bloodstream.

Metronidazole is also used to treat trichomoniasis, a sexually transmitted disease caused by a parasite. Usually both sexual partners are treated at the same time, even if one has no symptoms.

Do not use metronidazole to treat any condition that has not been checked by your doctor.

Warnings

You should not use metronidazole if you recently drank alcohol, or have taken disulfiram (Antabuse) within the past 2 weeks.

Do not drink alcohol or consume foods or medicines that contain propylene glycol while you are taking metronidazole and for at least 3 days after you stop taking it.

Seizures and other nervous system abnormalities have been reported in patients treated with metronidazole. You should stop using this medicine immediately if you experience any neurological symptoms such as seizures, headaches, visual changes, weakness, numbness, or tingling.

This medicine will not treat a viral infection such as the common cold or flu.

In animal studies (mice and rats), this medicine caused ce...