NelfinavirHIV Protease InhibitorsSaquinavirOxazinesRitonavirIndinavirBenzoxazinesStavudineAnti-HIV AgentsHIV InfectionsPyrimidinonesReverse Transcriptase InhibitorsLopinavirHIV ProteaseHIV-1CarbamatesDrug InteractionsDibenzocycloheptenesAspartic Acid ProteasesArea Under CurveLamivudineCost of IllnessDrug Resistance, ViralDrug Therapy, CombinationCritical IllnessCytochrome P-450 CYP3ASeverity of Illness IndexAntiretroviral Therapy, Highly Active