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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.
1 They may just slow down the reaction or stop it altogether. 2  Some inhibitors bond with the enzyme causing it to change shape and not work correctly. 3  The opposite of an inhibitor is an activator which can help to speed up the reaction. 4  Enzymes don't get used up after they do their job. 5  They can be used over and over.