Efficacy and Safety of Levalbuterol Versus Racemic Albuterol in Asthma

"levalbuterol 1.25 mg Period I: administered every 20 minutes for the first 3 doses, and then every 40 minutes for the next 3 doses; then as clinically indicated.~Period II: TID for 3 days (same time of day), then PRN to TID for 7 days"

"Racemic Albuterol 2.5 mg Period I: every 20 min for the first 3 doses, then every 40 min for the next 3 doses, then as clinically indicated.~Period II: TID for 3 days then PRN to TID for 7 days"