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Protease inhibitors (PIs) are medications that act by interfering with enzymes that cleave proteins. Some of the most well known are antiviral drugs widely used to treat HIV/AIDS hepatitis C and COVID-19. These protease inhibitors prevent viral replication by selectively binding to viral proteases (e.g. HIV-1 protease) and blocking proteolytic cleavage of protein precursors that are necessary for the production of infectious viral particles.
Protease inhibitors that have been developed and are currently used in clinical practice include:
Given the specificity of the target of these drugs there is the risk, like with antibiotics, of the development of drug-resistant mutated viruses. To reduce this risk, it is common to use several different drugs together that are each aimed at different targets.