the greater potency of isoxuprine and nylidrin in inhibiting alpha 1-adrenoreceptors than binding to beta 2-adrenoreceptors or causing nonspecific relaxation suggest that alpha-adrenoreceptor antagonist actions of these drugs may be important in their ability to inhibit smooth muscle tone .
C0001638
alpha 1-adrenoreceptors
C0034784
alpha-adrenoreceptor