WebMD
Font Size

St. John's Wort

St. John's wort (Hypericum perforatum) is a plant with yellow flowers that has been used to treat depression in European countries for centuries. It is sold in liquid and powder (pill) form and can be found at health food stores and pharmacies.

A person who wants to try St. John's wort should first talk to his or her doctor because it may interfere with treatment for other conditions. Also, herbal products are not regulated in the United States, so ingredients and quality can be inconsistent.

A person should not take St. John's wort while taking:

  • Other antidepressants. Taking both can result in serious, negative side effects.
  • Protease inhibitors (PIs) or nucleoside reverse transcriptase inhibitors (NRTIs) for the treatment of HIV infection.

ByHealthwise Staff
Primary Medical ReviewerAdam Husney, MD - Family Medicine
Specialist Medical ReviewerMarc S. Micozzi, MD, PhD - Complementary and Alternative Medicine
Last RevisedJune 29, 2011

WebMD Medical Reference from Healthwise

Last Updated: June 29, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.