Beschreibung
Fluconazole dramatically increases warfarin exposure, causing large INR elevations and a high risk of serious or life-threatening bleeding.
Mechanismus
Fluconazole is a potent CYP2C9 inhibitor and moderate CYP3A4 inhibitor, substantially reducing the clearance of both S- and R-warfarin enantiomers.
Klinische Bedeutung
S-warfarin AUC increases by ~90%; INR values can double or triple, with numerous case reports of major hemorrhage including intracranial bleeding.
Maßnahmen
Avoid concomitant use if possible. If essential, reduce warfarin dose by 25–50%, monitor INR daily or every other day during fluconazole therapy, and for 7 days after stopping fluconazole.
Medizinischer Haftungsausschluss
This content is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making medication decisions.