<p>The nizonide 500 mg tablets contain the active ingredient nitazoxanide, an antiparasitic medication used to treat worm infections. It is effective against a variety of intestinal parasites, including giardia and cryptosporidium. The medication works by inhibiting the energy production of parasites, leading to their death. Typically prescribed for both adults and children, Nizonide tablets are taken orally with food to enhance absorption. Common side effects may include nausea, abdominal pain, and headache. It is crucial to complete the full course of treatment as prescribed by a healthcare provider to ensure the infection is fully eradicated and to prevent recurrence.</p>