Drugs for giardia lambia

The treatment of choice is metronidazole for 5 days. One alternative agent is tinidazole, which is equally effective as metronidazole in the treatment of giardiasis but with a much shorter course of therapy (2 grams given once). Nitazoxanide, a nitrothiazole derivative structurally similar to aspirin, was recently approved for the treatment of giardiasis. Nitazoxanide is also equally efficacious as metronidazole and, in comparison, has a two-day-shorter course of therapy.