Until the late 1960s, codeine was considered the definitive over-the-counter cough medicine. It worked well. Maybe a little too well, because it was easy to get

Until the late 1960s, codeine was considered the definitive over-the-counter cough medicine. It worked well. Maybe a little too well, because it was easy to get addicted to it. So the FDA banned it from OTC sales and dextromethorphan was substituted. Which brings us to today.