YohimbineAdrenergic alpha-2 Receptor AntagonistsAdrenergic alpha-AntagonistsReceptors, Adrenergic, alphaReceptors, Adrenergic, alpha-2Adrenergic alpha-AgonistsClonidineAdrenergic AntagonistsAdrenergic alpha-2 Receptor AgonistsPrazosinNorepinephrineDioxanesXylazineAdrenergic AgonistsReceptors, AdrenergicQuinoxalinesDose-Response Relationship, DrugRats, Sprague-DawleyElectric StimulationIdazoxanAdrenergic alpha-1 Receptor AntagonistsHormone AntagonistsDopamine AntagonistsNarcotic AntagonistsOxymetazolineExcitatory Amino Acid AntagonistsNeurokinin-1 Receptor AntagonistsPhentolamineHistamine H2 AntagonistsInterleukin 1 Receptor Antagonist ProteinMuscarinic AntagonistsPiperidinesGABA AntagonistsHistamine H1 AntagonistsPurinergic P1 Receptor AntagonistsVas DeferensDrug InteractionsRadioligand AssayRats, WistarHistamine AntagonistsGuinea PigsNicotinic AntagonistsAdenosine A2 Receptor AntagonistsSympatholyticsImidazoline ReceptorsPurinergic P2 Receptor AntagonistsAzepinesEpinephrineChlorprothixeneAgmatineSerotonin 5-HT3 Receptor AntagonistsBinding, Competitive