Nizonide 500 tablet contains nitazoxanide, an antiparasitic medicine used to treat certain intestinal infections caused by parasites, including some protozoal infections. It may help relieve symptoms such as diarrhea, abdominal discomfort, nausea, and other digestive problems associated with susceptible infections. The medicine should be taken according to a healthcare professional’s advice, as the appropriate dose and treatment duration can vary depending on the infection and the patient’s condition. Taking it with food may improve absorption. Possible side effects can include stomach discomfort, headache, or nausea. If symptoms continue or worsen, consult a doctor for proper evaluation and treatment.