Dried, ripe seeds of Strychnos nux-vomica L., Loganiaceae. Habit. Southern Asia, Northern Australia. Constit. 1-1.4% strychnine, about an equal amount of brucine; strychnicine, loganin, caffeotannic (igasuric) acid, proteins. Nux vomica from Saigon contains 1.6-2% strychnine.
Formerly as bitter tonic.