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The nizonide 500mg is a prescription medication containing nitazoxanide, primarily used to treat parasitic infections. It is effective against protozoa and helminths, making it useful for conditions like giardiasis and cryptosporidiosis, which cause diarrhea and gastrointestinal discomfort. Nitazoxanide is also used in treating certain viral infections, such as rotavirus and norovirus in children. It works by inhibiting the energy production of parasites, leading to their death. The drug is typically prescribed for short-term use, and it's important to follow a doctor's advice on dosage and treatment duration to avoid side effects or resistance.