Among patients age 12 and older in a study of people with mild, persistent asthma, more than half did just as well, or better, on a placebo as they did on a steroid inhaler used twice per day to prevent symptoms.

Among patients age 12 and older in a study of people with mild, persistent asthma, more than half did just as well, or better, on a placebo as they did on a steroid inhaler used twice per day to prevent symptoms.