PrazosinDose-Response Relationship, DrugAdrenergic alpha-AntagonistsAdrenergic alpha-1 Receptor AntagonistsReceptors, Adrenergic, alphaReceptors, Adrenergic, alpha-1YohimbineAdrenergic alpha-AgonistsClonidineDioxanesNorepinephrineScorpion StingsPhenylephrineAdrenergic alpha-1 Receptor AgonistsAdrenergic AntagonistsReceptors, AdrenergicAdrenergic alpha-2 Receptor AntagonistsPhentolamineIdazoxanDoxazosinOxathiinsMethoxaminePhenoxybenzamineOxymetazolineReceptors, Adrenergic, alpha-2PropranololAporphinesVasoconstrictionRadioligand AssayMuscle ContractionAdrenergic alpha-2 Receptor AgonistsRats, Inbred StrainsQuinazolinesElectric StimulationAdrenergic beta-AntagonistsScorpionsRats, WistarBlood PressureDogsAntiveninsRats, Sprague-DawleyDesipramineQuinoxalinesEpinephrineRadiation DosageLethal Dose 50Time FactorsAcetonitrilesPiperazinesDrug InteractionsAdrenergic AgentsMuscle, Smooth, VascularBinding, CompetitiveMethyldopaReserpineRabbitsAdministration, OralHeart RateConsummatory BehaviorSympatholyticsXylazineDihydroergotamineMesenteric ArteriesHydralazineReceptors, Adrenergic, betaAzepinesAdrenergic Uptake InhibitorsDrug Administration ScheduleNifedipineDihydroergotoxineInjections, IntravenousRadiometryAntihypertensive AgentsKetanserinAorta, ThoracicDreams