Delayed-Action PreparationsTablets, Enteric-CoatedOxycodoneChemistry, PharmaceuticalTabletsAnalgesics, OpioidAdministration, OralFentanylPreanesthetic MedicationAdministration, BuccalExcipientsMethylphenidateEar, MiddleCyclohexanesSolubilityDrug CompoundingMucous MembraneMouth MucosaGastric MucosaTaurocholic AcidCross-Over StudiesDose-Response Relationship, DrugDouble-Blind MethodIntestinal MucosaIntestinal AbsorptionGastric AcidJejunumPermeabilityDuodenumIleumMembrane PotentialsAnesthetics, IntravenousIndomethacinAnalgesia, EpiduralRats, Inbred StrainsHydrogen-Ion ConcentrationSodiumSufentanilAdjuvants, AnesthesiaAnesthesia, IntravenousHistamine ReleaseAdministration, CutaneousAlfentanilBupivacainePain, PostoperativeAnesthetics, CombinedAnalgesia, ObstetricalPropofolMorphineAnesthesia, GeneralAnalgesia, Patient-ControlledAnesthesia Recovery PeriodMidazolamReceptors, Opioid, muAnesthetics, LocalPain MeasurementCalciumNitrous OxideNarcoticsBreakthrough PainNaloxoneIsofluraneAnesthetics, InhalationDrug InteractionsAnesthesia, EpiduralPainMethyl EthersAnalgesiaInjections, SpinalTime FactorsAnesthesia, ObstetricalAnesthesiaDroperidolConscious SedationMeperidineHypnotics and SedativesAnesthesia, InhalationAnestheticsCells, CulturedNarcotic AntagonistsRats, Sprague-DawleyTransdermal PatchInjections, IntravenousRyanodine Receptor Calcium Release ChannelNeurotransmitter AgentsPiperidinesHemodynamicsInfusions, IntravenousEnfluraneInfusion PumpsAnalgesicsKineticsCesarean SectionElectric StimulationNeuromuscular Nondepolarizing AgentsThiopentalPostoperative Nausea and VomitingRats, WistarAnesthesia, SpinalVirus Release