NifedipineCalcium Channel BlockersDiltiazemVerapamilCalciumDihydropyridinesCalcium Channels, L-TypeCalcium ChannelsDelayed-Action PreparationsGingival OvergrowthNicardipineCalcium Channel AgonistsTocolytic AgentsAtenololBlood PressureAdministration, SublingualMuscle ContractionVasodilator Agentsomega-Conotoxin GVIAFelodipineHypertensionDose-Response Relationship, DrugMibefradilMuscle, SmoothPyridinesMembrane PotentialsMuscle, Smooth, VascularAngina PectorisGuinea PigsTocolysisAmlodipineHeart RatePotassium ChlorideGallopamilDrug InteractionsPotassiumDouble-Blind MethodNitrendipineNorepinephrineNisoldipineCytochrome P-450 CYP3ARyanodineIsradipineAntihypertensive AgentsCells, CulturedVasoconstriction