the effects of the beta 2-adrenergic agonist salbutamol ( 0.02 ml/kg of a 0.5 % solution ) and the cholinergic antagonist ipratropium bromide ( 2 ml of a 0.025 % solution ) , administered alone or in combination at different doses , were evaluated in 48 asthmatic children using a single-dose , double-blind , crossover design .
C0001927
salbutamol
C0004096
asthmatic