Neurotoxins area unit substances that area unit toxic or damaging to nervous tissue.Neurotoxins area unit an intensive category of exogenous chemical neurologic insults which will adversely have an effect on perform in each developing and mature animal tissue. The term also can be wont to classify endogenous compounds, which, once abnormally contact, will prove neurologically cyanogenetic. although neurotoxins area unit usually neurologically damaging, their ability to specifically target neural elements is very important within the study of nervous systems. Common samples of neurotoxins embody lead, plant product (drinking alcohol), atomic number 25 salt, gas (NO), neurolysin (e.g. Botox), tetanus poison, and tetrodotoxin. Some substances like gas and salt area unit in reality essential for correct perform of the body and solely exert toxin effects at excessive concentrations.