Blue Flag

What other names is Blue Flag known by?

Clajeux, Iris, Iris caroliniana, Iris versicolor, Iris Versicolore, Iris virginica, Lirio Azul, Lis Bleu, Sweet Flag, Water Flag.

What is Blue Flag?

Blue flag is a plant. People use the underground stem (rhizome) of blue flag to make medicine.

Despite serious safety concerns, blue flag is used as a laxative and to relieve fluid retention and bloating. It is also used to treat swelling (inflammation) and skin conditions; and to prevent vomiting. Some people use it for liver problems and to increase bile production.

Insufficient Evidence to Rate Effectiveness for...

  • Constipation.
  • Fluid retention.
  • Increasing bile flow.
  • Liver problems.
  • Vomiting.
  • Skin rashes.
  • Other conditions.
More evidence is needed to rate the effectiveness of blue flag for these uses.

Natural Medicines Comprehensive Database rates effectiveness based on scientific evidence according to the following scale: Effective, Likely Effective, Possibly Effective, Possibly Ineffective, Likely Ineffective, and Insufficient Evidence to Rate (detailed description of each of the ratings).


Therapeutic Research Faculty copyright

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


Health Solutions From Our Sponsors