Nitazoxanide 500mg is an antiparasitic and antiviral medication primarily used to treat infections caused by protozoa, such as Cryptosporidium and Giardia. While it is effective against certain intestinal parasites, it is not the first-line treatment for common worm infections like roundworms, tapeworms, or hookworms. However, nitazoxanide 500mg has shown some efficacy against specific helminths, including some trematodes and cestodes. If you suspect a worm infection, consult a doctor to determine the appropriate treatment. Alternative medications like albendazole or mebendazole are more commonly prescribed for most worm infections rather than nitazoxanide 500mg.