MODERATE — Monitor Closely
CAUTION — additive hepatotoxicity risk with regular use
Evidence level: LIMITED
Both black cohosh and acetaminophen can stress your liver — combining may increase risk of liver damage.
Both have hepatotoxic potential. Black cohosh has been associated with rare cases of liver injury. Acetaminophen is a known dose-dependent hepatotoxin.
Avoid chronic combined use. Limit acetaminophen to less than 2g/day if using black cohosh regularly. Monitor liver function if using both long-term.
Take Acetaminophen 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.
Pre-existing liver disease, alcohol use, chronic use of either substance, high acetaminophen doses
Dark urine, yellowing of skin/eyes, abdominal pain, unusual fatigue, nausea
Request liver function monitoring if using both regularly. Report any symptoms of liver problems immediately.
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.
Both black cohosh and acetaminophen can stress your liver — combining may increase risk of liver damage.
Take Acetaminophen 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.
Dark urine, yellowing of skin/eyes, abdominal pain, unusual fatigue, nausea
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.
Request liver function monitoring if using both regularly. Report any symptoms of liver problems immediately.
Or browse the full interaction database (121,000+ pairs).