Drug EvaluationDrug Evaluation, PreclinicalDrug ApprovalDrug MonitoringPhenytoinPharmacology, ClinicalNortriptylinePharmacokineticsPharmaceutical PreparationsChromatography, High Pressure LiquidTriazolesAnticonvulsantsHIV Protease InhibitorsCarbamazepinePharmacological PhenomenaDigoxinDried Blood Spot TestingArea Under CurveImmunosuppressive AgentsTacrolimusFluorescence Polarization ImmunoassayPlasmaMycophenolic AcidPyrimidinonesLopinavirPrimidoneBlood Chemical AnalysisDrug InteractionsDose-Response Relationship, DrugVoltage-Gated Sodium Channel BlockersTheophyllineEthosuximideAntifungal AgentsMycosesPyrimidinesEnzyme Multiplied Immunoassay TechniqueAntidepressive Agents, TricyclicRitonavirCyclosporineChemistry, Clinical