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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.
Various compounds can reduce the activity of enzymes. They may act in a variety of different ways, and indeed may be reversible or irreversible inhibitors of the enzyme. On this page there are notes about: 1  Competitive inhibition. 2  Non-competitive inhibition. 3  Uncompetitive inhibition. 4  The choice of a competitive or non-competitive inhibitor as a drug. 5  Ki, the inhibitor constant.