Pharmacological action – analgesic (opioid). Possesses the properties of opioid receptor antagonist. Suppresses the CNS, has analgesic, sleeping pills, antic coughing effect. Excites mu-receptors and blocks kappa-receptors. It is well absorbed by all parenteral routes of administration: it starts to work 2-3 minutes after an IV and 15 minutes after Dmitry Sazonov an IV or IV injection.