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Metronidazole is an antibiotic and antiprotozoal medication used to treat various conditions such as inflammatory bowel disease, nonspecific diarrheal disorders, infections caused by Giardia (a cause of diarrhea), and periodontal disease.
The most common treatment for giardiasis is metronidazole (Flagyl) for 5-10 days. It has an efficacy rate of 75% to 100%, but it often causes gastrointestinal side effects such as nausea and a metallic taste as well as dizziness and headache.