- Barberry has been used in Indian folk medicine for centuries, and the Chinese have used berberine, a constituent of barberry, since ancient times. The first available documented use of berberine was in 1933 for trachoma (infectious eye disease).
- Historically, barberry was commonly used for its antidiarrheal and antibiotic properties. Barberry is considered tonic, purgative, and antiseptic. As a bitter stomachic tonic, it proves an excellent remedy for dyspepsia and functional derangement of the liver, regulating the digestive powers, and if given in larger doses, acting as a mild purgative and removing constipation. Traditionally, it is used in cases of jaundice, general debility and biliousness (gastric distress), and for diarrhea.
- Of most interest throughout history is berberine, an alkaloid found in barberry as well as goldenseal, tree turmeric and Oregon grape. The use of berberine is most commonly used for the management of diarrhea related to cholera and for the treatment of trachomas.
- Berberine has promising anti-inflammatory, antineoplastic (anti-cancer), hypoglycemic (blood sugar lowering), and immunomodulating effects. Current investigations into berberine continue. However, the use of barberry as a whole plant has been left relatively unexplored.