You’re probably thinking of the illegal anabolic steroids that some athletes take to improve performance. The most commonly prescribed asthma controller medication is an inhaled corticosteroid, which reduces airway inflammation. With less inflammation, the airways are less twitchy and sensitive and less likely to react to asthma triggers. This means you’ll have more control over your asthma — and your life. Oral steroids, which most often are given for severe attacks, can have significant side effects especially if taken for more than 2 weeks.  Proper asthma care should markedly decrease or eliminate the need for these medications.