PHARMACOLOGICAL ACTION กลไกลการออกฤทธิ์
Anti-Emetic drug, selective serotonin antagonist 5NT3-receptors.
Vysokoselektivnym is a potent antagonist ondansetron 5NT3-receptors.Mechanism to suppress nausea and vomiting is not precisely known.Radiation therapy and chemotherapy drugs may release serotonin (5NT) in the small intestine, calling the gag reflex through activation of 5NT3-receptors, and stimulation of afferent vagal nerve endings. Ondansetron blocks the initiation of this reflex. Activation of afferent vagal nerve endings, in turn,, may cause overshoot 5NT in back box bottom of fourth ventricle(area postrema), and, Therefore, start the gag reflex through a central mechanism. Thus, effect of ondansetron to suppress nausea and vomiting, inducing cytotoxic chemotherapy and radiotherapy, apparently, by antagonističeskomu on 5HT3-receptors of neurons, located on the periphery, and in the central nervous system.