Comparison of the Protective Effect of Ketotifen and Disodium Cromoglycate on Exercise‐Induced Asthma in Asthmatic Boys

Abstract
Fourteen boys with a mean age of 12.2 yr were studied with respect to the protective effect of ketotifen on exercise-induced asthma (EIA) in comparison with disodium cromoglycate (DSCG). All had a positive history of EIA and a post-exercise fall in FEV1 [1-s forced expiratory volume] of more than 20%. A double blind cross-over technique was used with a 1 wk wash-out period between the 2 treatment alternatives. Both drugs gave some, but not significant, protection for EIA and no differences between the 2 active substances tested were found. Great individual differences in the response to the 2 drugs were noted.