Generic Name: nitazoxanide (nye tah ZOX ah nide) Brand Names: Alinia (Spanish name, Daxon) What is nitazoxanide? Nitazoxanide is an antiprotozoal agent. Nitazoxanide is used to treat diarrhea in adults and children caused by the protozoa Giardia lamblia. Nitazoxanide is also used to treat diarrhea caused by the protozoa Cryptosporidium parvum. These conditions are also sometimes referred to as travelers` diarrhea. Nitazoxanide may also be used for purposes other than those listed in this medication guide.