Paxista, a prescription drug that combines the antiviral drugs nirmatrelvir (150 mg) and Ritonavir (100 mg), is used to treat a variety of viral infections, particularly when it is a component of an all-encompassing treatment plan for human immunodeficiency virus (HIV) infection. This antiretroviral therapy’s dual action of stopping viral replication and halting the course of HIV-related illnesses makes it effective.