Berberine: An alkaloid from Hydrastis canadensis L., Berberidaceae. It is also found in many other plants. It is relatively toxic parenterally, but has been used orally for various parasitic and fungal infections and as antidiarrheal.Berberine Alkaloids: A group of related plant alkaloids that contain the BERBERINE heterocyclic ring structure.Coptis: A plant genus of the family RANUNCULACEAE. Members contain BERBERINE and other isoquinoline ALKALOIDS.Hydrastis: A plant genus of the family RANUNCULACEAE. Members contain BERBERINE.