Nizonide 500 mg is an antiparasitic medication primarily containing the active ingredient Nitazoxanide. It is used to treat certain intestinal infections caused by parasites, particularly Cryptosporidium and Giardia, which can result in symptoms like diarrhea, abdominal pain, and nausea. Nizonide works by inhibiting the energy production of these parasites, thereby helping to eliminate them from the body. It is typically prescribed for short-term use, with dosages tailored to the patient’s age, weight, and the severity of the infection. The medication should be taken with food for optimal absorption, and side effects may include nausea, headache, and abdominal discomfort.