There are different ways of administering them though. These are prescribed for use every day. Corticosteroids and cromolyn sodium are included here. These relax the muscles that tighten around the airways. These may be prescribed for use only when symptoms are increased or for every day use.
Asthma medications are safe when taken as directed.
They are non addictive. As with any medication you must pay attention to your doctor or pharmacists instructions regarding their use and interactions with other products. They rarely become ineffectual and if they do your doctor can help you find a more suitable medication. Corticosteroids are different from the anabolic steroids taken illegally by some people to help build muscle mass, and in the meanwhile damaging their brain. Treatment needs to be started before you are in a danger zone.