The nizonide 500 mg, containing nitazoxanide, is an effective antiparasitic medication used to treat worm infections. It works by inhibiting the energy production of parasites, thereby eliminating them from the body. Typically prescribed for conditions like giardiasis or cryptosporidiosis, it is essential to follow the prescribed dosage and complete the full course to ensure complete eradication of the infection. Common side effects may include nausea, stomach pain, or headache. Always consult a healthcare provider before starting Nizonide 500 mg, especially if you have underlying health conditions or are taking other medications.