IndinavirHIV Protease InhibitorsRitonavirSaquinavirNelfinavirAnti-HIV AgentsHIV InfectionsStavudineDrug Therapy, CombinationOxazinesHIV ProteaseArea Under CurveLamivudineBenzoxazinesDrug InteractionsZidovudineHIV-1PyrimidinonesLopinavirReverse Transcriptase InhibitorsCarbamatesPyuriaCytochrome P-450 CYP3ACD4 Lymphocyte CountSophoraDrug Administration ScheduleViral LoadDidanosineAntiretroviral Therapy, Highly Active