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Is there any evidence that using Ginko biloba can increase blood pressure?

Yes
No
Maybe

Correct Answer : No. As a general rule, Ginkgo does not increase the blood pressure.

Ginkgo biloba is a very popular herb used primarily in the support of circulation. It is one of the most prescribed drugs in Germany (not just among the herbal medicines, but including all drugs). It is used to treat dercreased circulation to the brain and to the extremities. In a recent drug study printed in the Journal of the American Medical Association, it was shown to be of help in slowing the decline in mental function seen in Alzheimer's patients.

Interestingly, a Ginkgo tree survived the Hiroshima bomb. Subsequent studies have suggested that it could prevent long term effects seen after radiation exposure. Other potential roles for Ginkgo include its use as an antioxidant, anti-platelet, and as an anti-allergy medication.

As a general rule, Ginkgo does not increase the blood pressure. In patients with shock (dangerously low blood pressure), it has helped bring the pressure back toward normal.

The side effects seen most often with Ginkgo are gastrointestinal in nature. In some people lowered blood pressure has been observed, but this usually occured when it was given through a vein.

When using ginkgo, be sure to use a product guaranteed to provide 24% flavone glycosides and 6% terpene lactones. Remember that in the United States, ginkgo is considered a dietary supplement. It has not been approved by the FDA for any therapeutic use.

Dr. Richard Ogletree, assistant professor of clinical pharmacy practice for the University of Mississippi School of Pharmacy and coordinator of drug information and investigational drugs for the Department of Pharmacy Services at the University of Mississippi Medical Center, answers e-mailed questions online in the Ask the Pharmacist section.