PrazosinAdrenergic alpha-AntagonistsAdrenergic alpha-1 Receptor AntagonistsReceptors, Adrenergic, alphaReceptors, Adrenergic, alpha-1YohimbineAdrenergic alpha-AgonistsClonidineDioxanesNorepinephrineScorpion StingsPhenylephrineAdrenergic alpha-1 Receptor AgonistsAdrenergic AntagonistsReceptors, AdrenergicAdrenergic alpha-2 Receptor AntagonistsPhentolamineIdazoxanOxathiinsDoxazosinMethoxamineOxymetazolinePhenoxybenzamineReceptors, Adrenergic, alpha-2AporphinesPropranololVasoconstrictionRadioligand AssayAdrenergic alpha-2 Receptor AgonistsMuscle ContractionScorpionsQuinazolinesElectric StimulationRats, Inbred StrainsAdrenergic beta-AntagonistsAntiveninsDesipramineQuinoxalinesDose-Response Relationship, DrugAcetonitrilesMuscle, Smooth, VascularEpinephrineAdrenergic AgentsBinding, CompetitiveBlood PressureMethyldopaDogsReserpineConsummatory BehaviorRats, WistarMesenteric ArteriesDihydroergotamineXylazinePiperazinesHydralazineSympatholyticsReceptors, Adrenergic, betaDihydroergotoxineRabbitsAdrenergic Uptake InhibitorsRats, Sprague-DawleyAzepinesNifedipine