prophylactic

remedy that prevents or slows the course of an illness or disease; "the doctor recommended several preventatives"

contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse

capable of preventing conception or impregnation; "contraceptive devices and medications"

warding off; "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze

preventing or contributing to the prevention of disease; "preventive medicine"; "vaccines are prophylactic"; "a prophylactic drug"