Nitazoxanide API (Active Pharmaceutical Ingredient) is a broad-spectrum antiparasitic and antiviral agent. It functions as a prodrug, metabolizing to tizoxanide, which inhibits pyruvate:ferredoxin oxidoreductase (PFOR), an enzyme essential for anaerobic energy metabolism in protozoa and bacteria. Primarily used to treat infections caused by�Giardia lamblia�and�Cryptosporidium parvum, it also exhibits activity against various intestinal parasites, anaerobic bacteria, and certain viruses. As a key ingredient in formulated drugs, the API is characterized by its low solubility and is typically supplied as a fine, crystalline powder meeting stringent pharmacopeial standards for purity, potency, and microbiological quality.