Blue Flag Side Effects, Interactions and Warnings

Blue Flag Side Effects, Interactions and Warnings





  • Blue flag can cause nausea, vomiting, and loose stools.
    – Ellingwood F. — American Materia Medica, Therapeutics and Pharmacognosy, 11th ed. — Eclectic Medical Publications, 1998, 312-3.

  • Blue flag should only be taken on the advice of a physician or herbalist trained in its use. Blue flag is unsafe for children or for use during pregnancy or lactation. Use of blue flag as a cathartic laxative is not recommended.
    – McGuffin M, Hobbs C, Upton R, Goldberg A — American Herbal Product Association’s Herbal Safety Handbook. — CRC Press, 1997, 64.

  • There have not been extensive studies on the use of blue flag.














last update: March 2014



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