Prophylaxis n. (Med.) The art of preserving from, or of preventing, disease; the observance of the rules necessary for the preservation of health; preservative or preventive treatment.
... No medicine, Minnie. That's our slogan. This is the day of prophylaxis. The doctors have taken a step in the right direction and are giving fewer drugs. Christian Science has abolished drugs and established the healer. ... — Where There's A Will • Mary Roberts Rinehart