Abstract
Effects of flutropium bromide, a new bronchodilator with an anticholinergic action, alone or in combination with other antiasthma drugs were investigated in guinea pigs by using an index of inhibition of the acetylcholine (ACh)-induced bronchoconstriction. Single inhalation of flutropium bromide (0.0003%) into the airways of guinea pigs inhibited the ACh (i.v.)-induced bronchoconstriction without changing the fall in blood pressure induced by ACh. When salbutamol (3 μg/kg, i.v.), aminophylline (5 mg/kg, i.v.) or disodium cromoglycate (10 mg/kg, i.v.) was administered in combination with flutropium bromide (0.0003%), bronchodilation was enhanced as compared with single administration of the respective antiasthma drugs. From the above results, it is indicated that inhalation of flutropium bromide provides a more efficient bronchodilation in combination with other antiasthma drugs that possess different mechanisms of antiasthma effects.
