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Nitazoxanide 500 mg is a broad-spectrum antiparasitic and antiviral medication used to treat infections caused by protozoa, helminths, and certain viruses. It is commonly prescribed for diarrhea caused by Cryptosporidium parvum and Giardia lamblia in immunocompetent individuals. The nitazoxanide works by interfering with the energy metabolism of parasites and some viruses. It is also being studied for potential antiviral effects against influenza, rotavirus, and even COVID-19. The medication is taken orally, usually with food, to enhance absorption. Side effects may include nausea, abdominal pain, and headache. It is generally well-tolerated but should be used under medical supervision.