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nitazoxanide 500mg is an antiparasitic and antiviral medication primarily indicated for the treatment of diarrhea caused by protozoal infections such as Giardia lamblia and Cryptosporidium parvum. It works by inhibiting the growth of parasites in the intestines, helping to alleviate diarrhea symptoms. This medication is particularly useful for immunocompetent patients but can also be prescribed in certain cases for immunocompromised individuals. Nitazoxanide is typically taken twice daily for three days with food to enhance absorption. As with all medications, it's important to follow the prescribed dosage and consult a healthcare professional before use.