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Nizonide tablets contain Nitazoxanide, an antiparasitic and antiviral medication. They are primarily used to treat infections caused by protozoa and helminths, including Giardia lamblia and Cryptosporidium parvum. Additionally, nizonide 500mg is effective against various viral infections. It works by interfering with the energy production of parasites, leading to their death. This medication is typically prescribed for gastrointestinal infections causing diarrhea, especially in immunocompromised patients. Nizonide should be taken as directed by a healthcare provider, usually with food to enhance absorption. Common side effects include nausea, abdominal pain, and headaches. It is essential to complete the full course to prevent recurrence of the infection.