Nitazoxanide is an effective broad-spectrum antiparasitic medication used to treat infections caused by parasites such as Giardia lamblia and Cryptosporidium parvum. While it is highly effective for acute infections, its role in chronic parasitic infections depends on the parasite type and infection severity. In some cases, repeated or prolonged treatment may be required under medical supervision. Nitazoxanide works by interfering with the parasites’ energy metabolism, helping eliminate them from the body.