Strychnine is a highly toxic alkaloid derived from the seeds of the Strychnos nux-vomica tree, native to Southeast Asia and Australia. It is primarily known for its use as a pesticide, particularly for controlling rodents. Strychnine works by affecting the nervous system, leading to severe muscle spasms and convulsions. In small doses, strychnine can cause symptoms such as anxiety and restlessness, while larger doses can be fatal. Due to its toxicity, strychnine is regulated in many countries, and its use is restricted to specific applications. Safety precautions are essential when handling this dangerous substance.