the venom of the sri lankan green pit viper is hemotoxic. the bite of a sri lakan green pit viper is very painful, when someone is bitten by a sri lankan green pit viper the bitten area swells up, and the pain may last for a few days. the cells of living tissue die, blisters occur, and ptosis and lymphadenopathy take place. however, there have been no reports on deaths.