in this randomized , double-blind , crossover study , each of 20 male patients with moderate to severe asthma , ages 12 to 23 yr , received a single treatment with 100 , 200 , or 400 mcg of albuterol powder or placebo by rotahaler on 4 study days separated by 2 to 10 days .
C0004096
asthma
C0001927
albuterol