BupivacaineAnesthetics, LocalAnesthesia, SpinalAnalgesia, EpiduralDose-Response Relationship, DrugAmidesAnalgesia, ObstetricalAnesthesia, EpiduralLidocaineDouble-Blind MethodAnesthesia, ObstetricalNerve BlockPain, PostoperativeAnesthesia, CaudalEtidocaineAnesthesia, LocalSufentanilAnalgesics, OpioidFentanylAnesthetics, CombinedAdjuvants, AnesthesiaInjections, SpinalMepivacainePain MeasurementCesarean SectionDrug Administration ScheduleCarticaineTime FactorsMorphineAnalgesiaRats, WistarStereoisomerismAegleRats, Sprague-DawleyAdministration, OralPregnancyDrug CombinationsDose-Response Relationship, RadiationInjections, IntravenousSensationSubarachnoid SpaceAnalgesia, Patient-ControlledTreatment OutcomeLethal Dose 50Random AllocationPlant ExtractsDrug InteractionsAnalgesicsInfusions, IntravenousBrachial PlexusProspective StudiesInjections, IntramuscularLabor, ObstetricArea Under CurveDisease Models, AnimalInjectionsProcaineInjections, EpiduralAmbulatory Surgical ProceduresDrug Therapy, CombinationHemodynamicsRadiation DosagePrilocaineInjections, IntraperitonealPhytotherapyHeart RateHalf-LifeEpinephrineBlood PressureClonidineInjections, SubcutaneousSciatic NerveSpecific GravityThoracotomyCross-Over StudiesTramadolPreanesthetic MedicationHernia, InguinalAnesthesia Recovery PeriodAnalysis of Variance