Yunaconitine,extracted from several plants of Aconitum, has anti-inflammatory and analgesic actions.Guayewuanine B can increase serum total complement as well as the phag-ocytic activity of reticuloendothelial system in mice, these effects are considered to be beneficial in the clearance of pathogenic antigens, and may be the immunopharmacological basis of antiinflammatory actions of yunaconitine.