It's an antibiotic: Metronidazole is an antibiotic for treating protozoans like Entamoeba, Giardia, and Trichomonas; and bacteria like Bacteroides, Fusobacterium, peptostreptococci, Clostridium, Gardnerella, and Helicobacter. Topical (put on the skin surface) metronidazole is a treatment for rosacea (a facial rash disorder).
Answered 2/25/2018
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