<;P>;PROBLEM TO BE SOLVED: To provide a therapeutic or preventive medicine for cryptosporidiosis having excellent anti-Cryptosporidium activity. <;P>;SOLUTION: The therapeutic or preventive medicine for cryptosporidiosis contains an iron compound, a porphyrin compound, a porphyrin metal complex, and/or deferoxamine as active ingredients. <;P>;COPYRIGHT: (C)2010,JPO&INPIT