14-deoxy-11,12-didehydro Andrographolide is an analog of the natural diterpenoid andrographolide that can be isolated from A. paniculata. It retains the anti-inflammatory, antiallergenic, immuno-stimulatory, antiviral, antioxidant, hepatoprotective, and cardiovascular activities of andrographolide without producing cytotoxicity in KB cells (ED50 >20 μg/ml) that can occur with andrographolide 6.5 μg/ml.