The nitazoxanide tablets, commonly used to treat infections caused by protozoa and some viruses, can cause several side effects. Common side effects include nausea, stomach pain, diarrhea, and headache. Less commonly, individuals may experience vomiting, dizziness, and changes in urine or eye color, which could turn yellowish due to increased bilirubin levels. Serious allergic reactions, though rare, may involve rash, itching, swelling, severe dizziness, and difficulty breathing. Prolonged use might affect liver enzymes, so monitoring liver function is recommended. Always consult a healthcare professional if side effects worsen or persist while taking nitazoxanide.