“…Moreover, Ballinger & Borison (1957) failed to observe protection against apomorphine induced emesis in dogs pretreated with reserpine for several days. Similarly, reserpine pretreatment was ineffective in preventing the emesis induced by veratrum (Gourzis, 1955). There was no alteration in the level of catecholamines in the area postrema of dogs treated with apomorphine or morphine (Vogt, 1954).…”