The nizonide 500mg (Nitazoxanide) is an antiparasitic and antiviral medication used to treat infections that cause loose, watery bowel movements (diarrhea). It works by inhibiting the growth of certain parasites, such as Giardia lamblia and Cryptosporidium parvum, which can cause gastrointestinal infections. Nizonide is typically prescribed for conditions like traveler’s diarrhea or infections caused by contaminated food or water. It is important to take the medication as directed by your doctor, usually for 3-5 days, and maintain adequate hydration during the course to prevent dehydration from diarrhea. Consult your healthcare provider if symptoms persist or worsen.