Nizonide tablets contain the active ingredient Nitazoxanide, an antiparasitic medication used primarily to treat worm infections, particularly intestinal infections caused by protozoa and helminths. It is effective against conditions like giardiasis, amoebiasis, and cryptosporidiosis. The nizonide 500mg works by inhibiting the growth and multiplication of parasites in the body, leading to their elimination. It is usually prescribed for short-term use and should be taken as directed by a healthcare professional. Common side effects may include nausea, headache, or stomach pain. Nizonide is typically well-tolerated and is considered effective in treating various parasitic infections.