Concomitant use of interacting medications such as cotrimoxazole or amiodarone, as well as inadequate compliance, resulted in a significantly higher percentage of INR values above the therapeutic range in patients taking warfarin.
Cohort (n=128,584)
Yes
Warfarin is a commonly used anticoagulant medication that is prescribed to patients at risk of developing blood clots. However, warfarin has a narrow therapeutic index, meaning that small changes in its concentration can lead to serious side effects, such as bleeding or an increased risk of stroke. Therefore, it is essential for healthcare providers and patients to be aware of potential interactions between warfarin and other drugs or foods that can affect its effectiveness.
Alzahrani et al. (Sat,) conducted a cohort in Patients requiring anticoagulation (mitral stenosis, artificial or mechanical heart valve, or heart valve repair) (n=128,584). Warfarin and interacting drugs (e.g., cotrimoxazole, amiodarone) vs. Warfarin without interacting drugs was evaluated on Percentage of INR values above the therapeutic range. Concomitant use of interacting medications such as cotrimoxazole or amiodarone, as well as inadequate compliance, resulted in a significantly higher percentage of INR values above the therapeutic range in patients taking warfarin.