MODERATE — Monitor Closely
CAUTION — possible additive estrogenic effects; discuss with OB/GYN
Evidence level: STRONG
Black cohosh may add to or interfere with your estrogen therapy in unpredictable ways.
Black cohosh may have estrogenic or SERM-like activity. Combined with estradiol, may have additive estrogenic effects or unpredictable modulation.
Inform your prescriber about black cohosh use. Monitor for signs of estrogen excess.
Take Estradiol as prescribed. Black Cohosh can typically be taken with a meal at a different time. As a general rule, space botanicals 1-2 hours from prescription medications. St. John's Wort is the most interaction-prone botanical — it affects dozens of drugs via CYP enzyme induction. Always inform your prescriber about herbal supplements.
History of estrogen-sensitive conditions (breast cancer, endometriosis), concurrent hormone therapy
Breast tenderness, bloating, irregular bleeding, headaches
Discuss whether black cohosh is appropriate alongside hormone therapy.
Discuss safer alternatives with your healthcare provider. They can recommend substitutions based on your specific health goals while minimizing interaction risks. Always bring a complete list of everything you take to your appointments.
Black cohosh may add to or interfere with your estrogen therapy in unpredictable ways.
Take Estradiol as prescribed. Black Cohosh can typically be taken with a meal at a different time. As a general rule, space botanicals 1-2 hours from prescription medications. St. John's Wort is the most interaction-prone botanical — it affects dozens of drugs via CYP enzyme induction. Always inform your prescriber about herbal supplements.
Breast tenderness, bloating, irregular bleeding, headaches
Discuss safer alternatives with your healthcare provider. They can recommend substitutions based on your specific health goals while minimizing interaction risks. Always bring a complete list of everything you take to your appointments.
Discuss whether black cohosh is appropriate alongside hormone therapy.
Or browse the full interaction database (121,000+ pairs).