Nitazoxanide 500 Mg is an antiparasitic medication used to treat various infections caused by protozoa and certain types of helminths (worms). It is effective against Cryptosporidium parvum and Giardia lamblia, which cause gastrointestinal infections leading to diarrhea. Nitazoxanide is also used to treat infections caused by other parasites such as Entamoeba histolytica and helminthic infections like Hymenolepis nana (tapeworm) and Ascaris lumbricoides (roundworm). Its mechanism involves interfering with the energy metabolism of parasites, leading to their death or elimination from the body. Nizonide 500 is typically well-tolerated, but side effects such as nausea, abdominal pain, and headache may occur.