Effect of pancuronium bromide on the adrenergic reactivity of the isolated rat vas deferens.

Pancuronium bromide (10(-7) to 10(-4) M) failed to produce contraction of the isolated rat vas deferens. Also, no contractions were seen when the animals were pretreated with an MAO inhibitor (iproniazid 80 mg/kg, p.o.). On the other hand, pancuronium bromide (10(-6) to 10(-4) M) produced 1.62- to 2.65-fold increases in the sensitivity of the vas deferens to noradrenaline. This rules out an indirect adrenergic effect in this preparation and suggests an inhibitory effect on catecholamine uptake.