Nitazoxanide is an antiparasitic medicine commonly used to treat certain intestinal infections caused by parasites such as Giardia and Cryptosporidium. Availability without a prescription depends on the country and local pharmacy regulations, so it should not automatically be considered an over-the-counter medicine. Before using nitazoxanide, check the product label and consult a qualified healthcare professional to confirm whether it is appropriate for your symptoms. The correct strength and duration depend on factors such as age, infection type, and medical history. Avoid self-treatment when symptoms are severe, persistent, or accompanied by dehydration or blood in the stool. Always purchase medicines from a reputable, licensed pharmacy.