The nizonide 500mg is a prescription medication containing the active ingredient nitazoxanide. It is commonly used to treat diarrhea caused by infections, particularly those from protozoa such as Giardia lamblia and Cryptosporidium parvum. Nitazoxanide works by interfering with the metabolic processes of these parasites, helping to eliminate the infection from the body. The typical dosage is 500 mg, taken twice daily for a few days, depending on the severity of the infection and the patient’s age or health condition. As with any medication, it’s essential to follow the prescribed course and consult a healthcare professional for gui.