Moderate
Probable
Deskripsi
Doxycycline may enhance warfarin's anticoagulant effect, particularly in patients whose vitamin K intake is already limited.
Mekanisme
Doxycycline reduces intestinal flora that produce vitamin K2, potentially decreasing cofactor availability for synthesis of clotting factors II, VII, IX, and X.
Signifikansi Klinis
INR elevations are typically modest but can be clinically relevant in elderly patients or those with dietary vitamin K insufficiency.
Penatalaksanaan
Monitor INR after starting doxycycline; counsel patients on consistent dietary vitamin K intake during antibiotic therapy.