Beschreibung
Fluconazole inhibits CYP3A4-mediated tamsulosin metabolism, substantially increasing tamsulosin exposure and the risk of hypotension and syncope.
Mechanismus
CYP3A4 is a major route of tamsulosin metabolism; potent inhibition by fluconazole increases tamsulosin AUC significantly, amplifying alpha-1 adrenoceptor blockade-mediated vasodilation.
Klinische Bedeutung
Controlled drug interaction studies with strong CYP3A4 inhibitors show clinically significant tamsulosin concentration increases; symptomatic hypotension and dizziness are the primary safety concerns.
Maßnahmen
Advise patient on orthostatic hypotension precautions when fluconazole is prescribed concurrently; consider whether the antifungal indication can be treated with a less potent CYP3A4 inhibitor if tamsulosin is critical.
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.