Nitazoxanide is a thiazolid drug used primarily in the treatment of Giardia intestinalis infection in humans. In addition to its antiparasitic activity, it as also demonstrated promise against a broad spectrum of gram-postive and gram-negative bacterial pathogens, including both aerobic and anaerobic species.Nitazoxanide is soluble in DMSO, poorly soluble in ethanol, and practically insoluble in water.