Holarrhena Antidysenterica is a very significant herbal drug in Unani system of medicine and Ayurvedic system of medicine. This meticulous herb was used to treat a variety of infectious diseases especially in Staphylococcus aureus, Entamoeba histolytica and Escherichia coli. It is a large tree of 30 to 40 feet in height grows widely on the mountains. A large number of pharmacological studies have been done on the bark and seed of the tree.Keywords: Holarrhena Antidysenterica, Conessine, amoebic dysenter