An alkaloid (see ALKALOIDS) derived from Strychnos nux-vomica, the seeds of an East Indian tree, as well as from the seeds of several other closely allied trees and shrubs. It is a white crystalline body possessed of an intensely bitter taste which stimulates all parts of the nervous system. Strychnine poisoning is fortunately rare. It shows itself in CONVULSIONS, which come on very speedily after the person has taken the poison. The mental faculties remain unaffected, and the result may be recovery or death within a few hours.