[Action of synthetic substance P (SP) on the respiration, general metabolism and systemic hemodynamics of the anesthetized dog].

In the anaesthetized Dog, synthetic substance P in one dose (0.5 mug/kg i.v.) induced a quick hypotensive but short-lasting action and a respiratory analeptic activity which only appeared with some delay and lasted more than one hour. The possibility of a rapid metabolization of synthetic SP is discussed.