Nitazoxanide 500mg is an antiparasitic and broad-spectrum antiprotozoal medication primarily used for treating diarrhea caused by parasite infections of the intestines, such as Cryptosporidium parvum and Giardia lamblia. It also treats protozoan infections by inhibiting the production of chemicals required for energy metabolism and growth of parasites, helminths, and certain microbes. The drug is effective against gastrointestinal infections and can help resolve symptoms by stopping the growth of the parasites. It is typically taken with food at a fixed time. While generally safe, patients should consult a doctor before use, especially if pregnant, breastfeeding, or having liver or kidney issues. Caution is advised as the medication may cause dizziness, headache, nausea, and other mild side effects, which usually resolve on their own. Proper adherence to the full course of treatment is important to fully eliminate the infection and prevent resistance.