a study has been made of the bronchospasmolytic actions of theophylline and some ot its n-7-substituted derivatives administered by i.v infusion in anaesthetized guinea pigs , in which experimental bronchial asthma was induced by i.v . administration of histamine , 5-hydroxytryptamine and bradykinin .
C0039771
theophylline
C0004096
bronchial asthma