The best treatment for parasitic worm infections depends on the type of parasite involved. The nizonide 500 is an effective option, particularly for infections caused by Giardia lamblia and Cryptosporidium parvum. It contains nitazoxanide, which disrupts the energy metabolism of parasites, eliminating them from the body. Other medications like albendazole and mebendazole are commonly used for roundworms, tapeworms, and hookworms. Proper hygiene, clean drinking water, and a balanced diet help prevent reinfection. Always consult a doctor before using Nizonide 500 or any antiparasitic medication to ensure the right treatment and dosage for your specific condition.