Nizonide 500 is a medicine containing nitazoxanide, an antiparasitic and antiprotozoal drug used to treat certain intestinal infections. It is commonly prescribed for infections caused by parasites such as Giardia and Cryptosporidium. Nizonide 500 may help relieve symptoms including diarrhea, stomach discomfort, nausea, and abdominal cramps when these are associated with susceptible infections. The medicine should be taken according to a healthcare professional’s instructions, including the recommended dose and treatment duration. It is generally taken with food to improve absorption. Possible side effects may include nausea, headache, abdominal pain, or changes in urine color. Consult a doctor before using Nizonide 500, particularly if you have other medical conditions or take other medicines.