The nitazoxanide 500mg is an antiparasitic and antiviral medication. It is commonly used to treat infections like giardiasis and cryptosporidiosis, which affect the intestines. The drug works by interfering with the energy production of parasites and viruses, making it effective against various infections. It is taken orally, usually twice a day, with or without food. Nitazoxanide is available by prescription and should be taken as directed by a healthcare provider. Common side effects may include nausea, stomach pain, or headaches. It is important to complete the full course of the medication to ensure effectiveness.