Anticholinergics, cromolyn, and other occasionally useful drugs.

In asthmatics who are not controlled with beta-adrenergic agonists, theophylline and corticosteroids, the addition of anticholinergics may be beneficial. Cromolyn and the calcium-channel blocking agents are useful in preventing asthma attacks in some patients. Some other agents that have been proposed for the treatment of asthma are discussed briefly.