Which site does tadalafil target?

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Study for the Pharmacology Presentation Drugs Test. Delve into flashcards and multiple choice questions with hints and explanations. Gear up for examination success!

Multiple Choice

Which site does tadalafil target?

Explanation:
The key idea is that tadalafil works by blocking the catalytic (active) site of the enzyme PDE5. By binding to this active site, it prevents PDE5 from hydrolyzing cGMP. As a result, cGMP levels rise, promoting smooth muscle relaxation in the erectile tissue via the NO–cGMP pathway, which helps achieve an erection. Tadalafil is selective for PDE5 over other phosphodiesterases, such as PDE3 or PDE4, so its primary target is the catalytic site of PDE5 rather than other enzymes or allosteric sites. That’s why the correct choice is the active site of PDE5.

The key idea is that tadalafil works by blocking the catalytic (active) site of the enzyme PDE5. By binding to this active site, it prevents PDE5 from hydrolyzing cGMP. As a result, cGMP levels rise, promoting smooth muscle relaxation in the erectile tissue via the NO–cGMP pathway, which helps achieve an erection.

Tadalafil is selective for PDE5 over other phosphodiesterases, such as PDE3 or PDE4, so its primary target is the catalytic site of PDE5 rather than other enzymes or allosteric sites. That’s why the correct choice is the active site of PDE5.

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