PURPOSE: To obtain an infectious disease preventing drug to be inserted into the vagina or the anus in sexual intercourse, preventing malignant virus infection such as AIDS, having contraceptive action, containing a povidone-iodine drug as a main drug.

CONSTITUTION: An infectious disease preventing drug which comprises a povidone-iodine drug having strongly germicidal power and high safety to mucosa as a main drug in the dosage form of solution, jelly, solid, film or capsule having built-in solution is inserted into the vagina or the anus in sexual intercourse. Germicidal effects can be raised by applying the drug to the surface or the inside of a condom and putting on.