In English this is called Emetic Nut.
In Telugu and Tamil its name is walursi, walsura.The plant is found in Kerala State, Tamil Nadu and Sri Lanka, mainly.
The bark of the stem contains resin, saponin and tannin.
As a drug it has been found to be emetic and also emmenagoguic, aiding in setting right the disorders of menstruation rhythm. It is also a stimulant and an expectorant. It acts as a fish poison alright but the fishermen who attempt catching fish by this means find that such fish is not wholesome to eat.
The fruit has been used in washing hair to kill lice and also to remove the freckles on the skin surface and curing chronic itching.