NelfinavirRitonavirHIV Protease InhibitorsLopinavirPyrimidinonesSaquinavirIndinavirAnti-HIV AgentsOxazinesHIV InfectionsBenzoxazinesDrug InteractionsCarbamatesArea Under CurveReverse Transcriptase InhibitorsStavudineDrug Therapy, CombinationHIV-1Cytochrome P-450 CYP3AHIV ProteaseSulfonamidesAntiretroviral Therapy, Highly ActiveDrug Resistance, ViralLamivudineViral LoadPyridinesOligopeptidesCD4 Lymphocyte CountOrganophosphonatesDibenzocycloheptenesAspartic Acid ProteasesP-GlycoproteinDrug CombinationsRNA, ViralZidovudinePlasmaDrug Administration ScheduleNevirapineAdenineCross-Over StudiesTreatment FailureDrug Resistance, Multiple, ViralDideoxynucleosidesAryl Hydrocarbon HydroxylasesAnti-Retroviral AgentsHIV-Associated Lipodystrophy SyndromeProtease Inhibitors