Pharmacist notes: 3/16—discussed proper use of MDI and observed patient use. Coached Mr. Johnson to inhale slowly (he was inhaling fast) ; he used the MDI correctly for the other steps. Which of the following classes of drugs is preferred for Mr. Johnson for optimal control of asthma?

A. Anticholinergics
B. Inhaled corticosteroids
C. Methylxanthines
D. Long-acting β2-agonists