Is Echinacea Safe with 5-Fluorouracil (5-FU)?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Cancer patients receiving 5-fluorouracil should consult their oncologist before using Echinacea supplements. Echinacea may counteract the immunosuppressive effects of chemotherapy and has shown cell-proliferative activity in certain cancer cell lines, potentially undermining treatment.
Why this interaction occurs
Echinacea is an immune stimulant that may antagonize the immunosuppressive effects of 5-FU. Additionally, Echinacea extracts demonstrated proliferative activity in HeLa and QBC-939 cancer cell lines, raising concern that it may promote tumor cell growth and interfere with chemotherapy outcomes.
Evidence
Evidence level: limited.
Data source
PubMed - PMID 27114944
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 5,651,930 reports mentioning 5-Fluorouracil (5-FU). This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the 5-Fluorouracil (5-FU) + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Echinacea interactions → · All 5-Fluorouracil (5-FU) interactions →
Already checked this one — check your whole list
Educational only — not medical advice.
Always confirm with your doctor or pharmacist.