NifedipineCalcium Channel BlockersDiltiazemVerapamilCalciumDelayed-Action PreparationsDihydropyridinesCalcium Channels, L-TypeCalcium ChannelsDose-Response Relationship, DrugDouble-Blind MethodGingival OvergrowthNicardipineBlood PressureTocolytic AgentsAtenololCalcium Channel AgonistsAdministration, SublingualDrug Therapy, CombinationVasodilator AgentsTreatment OutcomeDrug InteractionsAdministration, OralHypertensionMuscle ContractionClinical Trials as TopicPyridinesTime FactorsDrug-Related Side Effects and Adverse ReactionsFelodipineomega-Conotoxin GVIAHeart RateMembrane PotentialsGuinea PigsMuscle, SmoothMibefradilAngina PectorisRats, Sprague-DawleyMuscle, Smooth, VascularPotassiumAntihypertensive AgentsRats, WistarAmlodipineRandom AllocationPotassium ChlorideTocolysisGallopamilNorepinephrineCells, CulturedDrug EvaluationNitrendipineCytochrome P-450 CYP3ADrug Administration ScheduleNisoldipineHemodynamicsAntipsychotic AgentsRyanodineIsradipineVasoconstrictionInjections, Intravenous