Common side effects of Nitazoxanide 200 Mg include nausea, diarrhea, abdominal pain, headache, and dizziness. These are usually mild and temporary. Rare side effects may include allergic reactions, liver function abnormalities, and changes in blood cell counts. It's important to seek medical attention if severe or persistent side effects occur, such as jaundice, rash, itching, or difficulty breathing.Nizonide 200 Patients with pre-existing liver conditions should be monitored closely during nitazoxanide treatment.