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The mesylate salt of a centrally-acting neurokinin 1 (NK1) receptor antagonist with antidepressant and antiemetic activities. Casopitant competitively binds to and blocks the activity of the NK1 receptor, thereby inhibiting NK1-receptor binding of the endogenous tachykinin neuropeptide substance P (SP), which may result in antiemetic effects. SP is found in neurons of vagal afferent fibers innervating the brain-stem nucleus tractus solitarii and the area postrema, which contains the chemoreceptor trigger zone (CTZ), and may be elevated in response to chemotherapy. The NK1 receptor is a G-protein receptor coupled to the inositol phosphate signal-transduction pathway and is found in both the nucleus tractus solitarii and the area postrema. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C61086\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C61086\' NCI Thesaurus)
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