Ritonavir is primarily used as an antiretroviral drug for the treatment of HIV-1 infection. It is used in combination with other antiretroviral agents.
Pharmacological Action
Ritonavir is a protease inhibitor that is used to inhibit the HIV protease enzyme. This inhibition prevents the cleavage of the viral polyprotein, resulting in the production of immature, non-infectious viral particles. The key pharmacological actions of Ritonavir include:
Inhibition of HIV-1 Protease: Ritonavir inhibits the action of HIV-1 protease, an enzyme essential for the proteolytic cleavage of the viral polyprotein precursors into individual functional proteins during the viral replication cycle.
Boosting Effect: Ritonavir is also utilized for its ability to inhibit cytochrome P450 3A4 (CYP3A4), an enzyme involved in the metabolism of many antiretroviral drugs. This inhibition increases the plasma concentrations of co-administered protease inhibitors, thereby ‘boosting’ their effectiveness.
