“ Hydroxyzine in a concentration of 1:100,000 effectively blocked the spasmogenic actions of oxytocin (2.5 units/1000) on the isolated virgin guinea pig uterus.”
“This same dose of hydroxyzine given intravenously inhibited and blocked increased uterine activity incident to the administration of both natural and synthetic oxytocin in a dose of 0.5 units per kilogram of body weight in the anesthetized dog.”