Duloxetine and Tamoxifen: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Duloxetine interacts with Tamoxifen

Duloxetine is a moderate CYP2D6 inhibitor and may reduce conversion of tamoxifen to its active metabolite endoxifen, potentially decreasing breast cancer efficacy.

What you should do

Avoid CYP2D6 inhibitors in patients on tamoxifen; use venlafaxine or escitalopram for depression/hot flushes instead.

Key facts

Severity

Moderate — caution required

Mechanism

Duloxetine is a moderate CYP2D6 inhibitor and may reduce conversion of tamoxifen to its active metabolite endoxifen, pot...

Action

Avoid CYP2D6 inhibitors in patients on tamoxifen; use venlafaxine or escitalopram for depression/hot flushes instead.

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 Duloxetine and Tamoxifen together?

With caution. Avoid CYP2D6 inhibitors in patients on tamoxifen; use venlafaxine or escitalopram for depression/hot flushes instead.

What is the severity of this interaction?

The interaction between Duloxetine and Tamoxifen is classified as Moderate — caution required. Duloxetine is a moderate CYP2D6 inhibitor and may reduce conversion of tamoxifen to its active metabolite endoxifen, potentially decreasing breast cancer efficacy.

What should I do if I'm prescribed both?

Avoid CYP2D6 inhibitors in patients on tamoxifen; use venlafaxine or escitalopram for depression/hot flushes instead. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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