Metronidazole is an antibiotic and antiparasitic drug classified as a nitroimidazole. It inhibits nucleic acid synthesis and is used for the treatment of infections involving anaerobic bacteria as well as protozoal infections.

Conditions it is useful in include: giardiasis, amoebiasis, Trichomonas vaginalis infections, bacterial vaginosis, pseudomembranous colitis, Helicobacter pylori infections, and acne rosacea.

Brand names for metronidazole include Flagyl, Metryl, Protostat, Satric, and Neo-Tric.

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