https://www.breastcancer.org/research-news/effexor-vs-hrt-for-hot-flashesHowever, be careful to avoid some antidepressants which are are "such strong inhibitors of CYP2D6 that women who take these drugs may not benefit from tamoxifen. Two papers suggest that three antidepressants — paroxetine (Paxil), fluoxetine (Prozac), and bupropion (Wellbutrin) — are most likely to inhibit CYP2D6 and interfere with tamoxifen treatment."
Antidepressants vary in their ability to inhibit CYP2D6 (the enzyme that converts tamoxifen into its active form, endoxifen). |
Drug | Effect on CYP2D6 | Advice |
venlafaxine (Effexor) | Minimal | Safest choice if taken with tamoxifen. |
desvenlafaxine (Pristiq), mirtazapine (Remeron) | Direct studies with tamoxifen are lacking, but effect on endoxifen levels should be minimal. |
citalopram (Celexa), escitalopram (Lexapro), nefazodone (Serzone) | Mild | Secondary choices if above are not options. Only citalopram and sertraline have been studied directly with tamoxifen, so risk of reducing levels of endoxifen should be weighed against benefits of antidepressants. |
duloxetine (Cymbalta), sertraline (Zoloft), fluvoxamine (Luvox) | Moderate |
paroxetine (Paxil), fluoxetine (Prozac), bupropion (Wellbutrin) | Strong | Best to avoid if taking tamoxifen. |
https://www.health.harvard.edu/newsletter_article/antidepressants-and-tamoxifen