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An example of a medicinal enzyme inhibitor is sildenafil (Viagra), a common treatment for male erectile dysfunction. Drugs also are used to inhibit enzymes needed for the survival of pathogens. For example, bacteria are surrounded by a thick cell wall made of a net-like polymer called peptidoglycan.
Protease inhibitors are metabolised by enzymes in the liver and can interact with other medications by speeding up or slowing down their processing in the body. Ritonavir, in particular, is a strong inhibitor of these liver enzymes and slows the processing of many other drugs.rotease inhibitors. Protease inhibitors block the activity of the protease enzyme, which HIV uses to break up large polyproteins into the smaller pieces required for assembly of new viral particles.