Used primarily in the past as a pesticide to control rodents and other pests due to its high toxicity. It acts as a neurotoxin, causing severe muscular convulsions and eventually death in target organisms. In veterinary medicine, it has been employed in very controlled doses as a stimulant for certain animals, though its use is now largely obsolete due to safety concerns and the availability of safer alternatives. In research, it serves as a tool to study the nervous system, particularly the role of glycine receptors, as it blocks these receptors, leading to overstimulation of neural activity. Its application is strictly regulated due to its extreme potency and potential for misuse.