Drug ResistanceDrug Resistance, ViralDrug Resistance, NeoplasmDrug Resistance, MultipleDrug Resistance, MicrobialDrug Resistance, BacterialDouble-Blind MethodDrug Resistance, Multiple, BacterialAnti-Bacterial AgentsMicrobial Sensitivity TestsDrug Resistance, FungalMutationDisease ResistanceTreatment OutcomeDrug Resistance, Multiple, ViralP-GlycoproteinVascular ResistanceAnti-HIV AgentsAntitubercular AgentsAntineoplastic AgentsDrug Therapy, CombinationAntimalarialsDrug CombinationsTuberculosis, Multidrug-ResistantHIV InfectionsDose-Response Relationship, DrugHIV-1HIV ProteaseAdministration, OralMultidrug Resistance-Associated ProteinsPlacebosMolecular Sequence DataGenotypeHIV Reverse TranscriptaseMycobacterium tuberculosisDrug Administration ScheduleR FactorsTime FactorsATP-Binding Cassette TransportersTreatment FailureCell Line, TumorGenes, MDRTetracycline ResistanceDrug Resistance, Multiple, FungalPenicillin ResistanceStreptomycinCross-Over StudiesAntifungal AgentsAntiviral AgentsDoxorubicinTetracyclineReverse Transcriptase InhibitorsIsoniazidChloroquineSequence Analysis, DNABacterial ProteinsAnti-Infective AgentsPlant DiseasesInfusions, IntravenousParasitic Sensitivity TestsPhenotypeRifampinPlasmodium falciparumDNA, BacterialQuinolinesPiperazinesEscherichia coliAirway ResistanceProspective StudiesConjugation, GeneticBase SequenceNeoplasmsPolymerase Chain ReactionPyrimethaminePlasmidsAdministration, InhalationMutation, MissenseMembrane Transport ProteinsApoptosisTumor Cells, CulturedKanamycinbeta-Lactam ResistanceHIV Protease InhibitorsEthanolaminesResistance TrainingCephalosporinsDrug InteractionsAmino Acid SequenceChloramphenicol ResistanceAcyclovirMalaria, FalciparumCell SurvivalAlfentanilScopolamine DerivativesGenes, BacterialInhibitory Concentration 50SulfadoxineAmpicillin ResistanceTetrahydrofolate Dehydrogenasepol Gene Products, Human Immunodeficiency Virus