Which drugs were "popular" in World War II?

Penicillin, morphine, chlorguanidine and quinine.

Chloroguanidine and quinine were the main drugs used to fight malaria, and the use of anti-malarials saved many lives during World War II, ensuring that soldiers could stay away from malaria.

Morphine was also heavily used as an analgesic by military doctors in various countries during World War II. The U.S. took it a step further, as medics were able to effectively administer controlled amounts of morphine to wounded soldiers directly on the front lines, according to reports, and of course, it had something to do with the company, as Schweppes' Siret Morphine Hypodermic Syringe resembles a miniature toothpaste tube containing 32 milligrams of morphine. The tube is sealed at the mouth and fronted by a double-ended syringe, which is used by pressing down on the syringe to break the seal and then injecting subcutaneously. The syringe is pinned to the casualty's collar after the injection, so that the morphine dosage can be calculated to prevent an overdose.

In World War II, penicillin saved many sick and wounded in time. The importance of penicillin to the soldiers and to that particular period of history is somewhat captured in a propaganda poster about World War II, with the slogan: "Thanks to penicillin, wounded soldiers can go home in peace." Penicillin was affectionately referred to as the "life-saving drug" by the Allied soldiers. Along with the atomic bomb and radar, penicillin was one of the three major inventions of World War II. Fleming, Chinn and Flory, who were involved in the development of penicillin, were awarded the Nobel Prize in Medicine and Physiology in 1945***.