SAFE — No Known Interaction
🟢 SAFE — Levothyroxine and Black Cohosh can be taken together safely.
Evidence level: THEORETICAL
Levothyroxine and Black Cohosh are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
No clinically significant interaction between Levothyroxine and Black Cohosh has been identified in medical literature or FDA drug labeling.
No interaction documented between Levothyroxine and Black Cohosh. Always inform your healthcare provider about all supplements you take.
Take Levothyroxine and Black Cohosh with food, spaced at least 1-2 hours apart if possible. Botanicals contain complex phytochemicals that can interact with many substances — when in doubt, separation by mealtime is the safest approach.
Higher risk for: elderly with cardiac conditions, those with adrenal insufficiency, recent thyroid dose adjustments, concurrent calcium/iron/antacid use (absorption interference), or narrow therapeutic index sensitivity.
Monitor thyroid function when combining Levothyroxine with Black Cohosh. Some medications can alter thyroid hormone levels or metabolism. Watch for hypo symptoms (fatigue, weight gain, cold sensitivity, constipation) or hyper symptoms (anxiety, rapid pulse, weight loss, tremors, heat intolerance). Get thyroid levels (TSH, free T4) rechecked 6-8 weeks after starting or stopping the combination. When to seek emergency help: Chest pain, rapid or irregular heartbeat, high fever with confusion, or severe swelling of the neck.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Black Cohosh — is that OK?"
Safe combination at standard doses. Continue your medication as prescribed. Inform your doctor or pharmacist that you are using both, so they can monitor for any changes over time.
Levothyroxine and Black Cohosh are generally considered safe to use together based on current medical evidence. No adverse interactions have been reported.
Take Levothyroxine and Black Cohosh with food, spaced at least 1-2 hours apart if possible. Botanicals contain complex phytochemicals that can interact with many substances — when in doubt, separation by mealtime is the safest approach.
Monitor thyroid function when combining Levothyroxine with Black Cohosh. Some medications can alter thyroid hormone levels or metabolism. Watch for hypo symptoms (fatigue, weight gain, cold sensitivity, constipation) or hyper symptoms (anxiety, rapid pulse, weight loss, tremors, heat intolerance). Get thyroid levels (TSH, free T4) rechecked 6-8 weeks after starting or stopping the combination. When to seek emergency help: Chest pain, rapid or irregular heartbeat, high fever with confusion, or severe swelling of the neck.
Safe combination at standard doses. Continue your medication as prescribed. Inform your doctor or pharmacist that you are using both, so they can monitor for any changes over time.
No urgent need to discuss, but always keep your doctor informed of your full supplement and medication list. Say: "I take Levothyroxine and Black Cohosh — is that OK?"
Or browse the full interaction database (121,000+ pairs).