What is an important warfarin-statin interaction to monitor?

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What is an important warfarin-statin interaction to monitor?

Warfarin effect is easily disrupted by other drugs because it has a narrow therapeutic window, so anything that alters warfarin exposure can raise bleeding risk. Some statins can increase warfarin activity by affecting hepatic metabolism or displacing warfarin from its protein binding sites. Because of this potential interaction, you should check the INR when a statin is started or when the statin dose is changed, and adjust the warfarin dose as needed to keep the INR in the target range. In practice, obtain an INR within 1–2 weeks after initiating or altering a statin, then continue regular monitoring. While not all statins cause a clinically important interaction, the possibility means vigilance is warranted and patients should be advised to report signs of bleeding.

Warfarin effect is easily disrupted by other drugs because it has a narrow therapeutic window, so anything that alters warfarin exposure can raise bleeding risk. Some statins can increase warfarin activity by affecting hepatic metabolism or displacing warfarin from its protein binding sites. Because of this potential interaction, you should check the INR when a statin is started or when the statin dose is changed, and adjust the warfarin dose as needed to keep the INR in the target range. In practice, obtain an INR within 1–2 weeks after initiating or altering a statin, then continue regular monitoring. While not all statins cause a clinically important interaction, the possibility means vigilance is warranted and patients should be advised to report signs of bleeding.

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