NifedipineCalcium Channel BlockersDiltiazemVerapamilCalciumDihydropyridinesCalcium Channels, L-TypeCalcium ChannelsDelayed-Action PreparationsGingival OvergrowthNicardipineCalcium Channel AgonistsTocolytic AgentsAtenololBlood PressureAdministration, SublingualMuscle ContractionVasodilator Agentsomega-Conotoxin GVIAFelodipineHypertensionMibefradilDose-Response Relationship, DrugMuscle, SmoothPyridinesMembrane PotentialsAngina PectorisMuscle, Smooth, VascularGuinea PigsTocolysisPotassium ChlorideGallopamilAmlodipineHeart RateDrug InteractionsPotassiumNitrendipineDouble-Blind MethodNorepinephrineNisoldipineCytochrome P-450 CYP3ARyanodineIsradipineAntihypertensive AgentsVasoconstriction