Ketoconazole and Tamsulosin: Drug Interaction Guide

Quick answer: This combination requires caution. Ketoconazole and Tamsulosin can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Ketoconazole interacts with Tamsulosin

Ketoconazole strongly inhibits CYP3A4 and CYP2D6, the enzymes that metabolise tamsulosin, raising its plasma concentration and risk of orthostatic hypotension.

What you should do

Avoid combination with strong CYP3A4 inhibitors; if unavoidable, monitor blood pressure carefully and consider holding tamsulosin.

Key facts

Severity

Moderate — caution required

Mechanism

Ketoconazole strongly inhibits CYP3A4 and CYP2D6, the enzymes that metabolise tamsulosin, raising its plasma concentrati...

Action

Avoid combination with strong CYP3A4 inhibitors; if unavoidable, monitor blood pressure carefully and consider holding t...

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Ketoconazole and Tamsulosin together?

With caution. Avoid combination with strong CYP3A4 inhibitors; if unavoidable, monitor blood pressure carefully and consider holding tamsulosin.

What is the severity of this interaction?

The interaction between Ketoconazole and Tamsulosin is classified as Moderate — caution required. Ketoconazole strongly inhibits CYP3A4 and CYP2D6, the enzymes that metabolise tamsulosin, raising its plasma concentration and risk of orthostatic hypotension.

What should I do if I'm prescribed both?

Avoid combination with strong CYP3A4 inhibitors; if unavoidable, monitor blood pressure carefully and consider holding tamsulosin. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.