YohimbineAdrenergic alpha-AntagonistsAdrenergic alpha-2 Receptor AntagonistsReceptors, Adrenergic, alphaClonidineReversal LearningPrazosinReceptors, Adrenergic, alpha-2Adrenergic alpha-AgonistsNorepinephrineIdazoxanAdrenergic AntagonistsDioxanesReceptors, AdrenergicOxymetazolineAdrenergic alpha-2 Receptor AgonistsXylazinePhentolamineAdrenergic alpha-1 Receptor AntagonistsChlorprothixeneVas DeferensImidazoline ReceptorsSympatholyticsAgmatineEpinephrineDose-Response Relationship, DrugElectric StimulationMydriasisQuinoxalinesMedetomidineDrug InteractionsRats, Inbred StrainsExtinction, PsychologicalSympathetic Nervous SystemDihydroergotoxineDihydroergotamineDexmedetomidinePenile ErectionRats, Sprague-DawleyPhenoxybenzaminePhenylephrineMethysergideGuinea PigsTetralonesTolazolineMuscle Contractiongamma-CyclodextrinsAdrenergic AgonistsDrug-Seeking BehaviorNeuroeffector JunctionCatecholaminesAdrenergic NeuronsReceptors, Adrenergic, alpha-1DogsNordefrinMembrane PotentialsPropranololAzepinesNaloxoneMethoxamineParasympathetic Nervous Systemalpha-MethyltyrosineSerotonin AntagonistsRats, Long-EvansGuanabenzBlood PressureBehavior, AnimalSeptal NucleiRadioligand AssaySympathomimeticsReserpine