saquinavir + ritonavir + emtricitabine + tenofovir disoproxil fumarate

This is a combination antiretroviral therapy regimen consisting of four separate medications used together for HIV treatment. It combines two protease inhibitors (saquinavir and ritonavir) with two nucleoside/nucleotide reverse transcriptase inhibitors (emtricitabine and tenofovir disoproxil fumarate). Ritonavir serves primarily as a pharmacokinetic booster for saquinavir by inhibiting CYP3A enzymes, significantly increasing saquinavir plasma levels. Emtricitabine and tenofovir disoproxil fumarate work by inhibiting HIV reverse transcriptase, preventing viral DNA synthesis. This multi-drug regimen targets different stages of the HIV lifecycle to effectively suppress viral replication.