DoxazosinAdrenergic alpha-1 Receptor AntagonistsAdrenergic alpha-AntagonistsAdrenergic beta-AntagonistsCalcium Channel BlockersAngiotensin II Type 1 Receptor BlockersPotassium Channel BlockersSodium Channel BlockersNifedipineTetrazolesCalciumDihydropyridinesVerapamilDiltiazemPotassium ChannelsAngiotensin Receptor AntagonistsBenzimidazolesAngiotensin-Converting Enzyme InhibitorsAntihypertensive AgentsMembrane PotentialsPatch-Clamp TechniquesAmlodipineDose-Response Relationship, DrugRats, Sprague-DawleyGanglionic Blockers4-AminopyridineCalcium ChannelsNitrobenzoates