Neurotoxin
A neurotoxin, neural toxin, or nerve toxin was a toxin which specifically affected the nervous system.

In 2024, Adam Soong used a neurotoxin applied to a silicon patch on his hand to kill Tallinn, who was impersonating the intended target: Renée Picard. ()

In 2151, a Klingon ship raided a Xarantine outpost and stole, among other things, Xarantine ale. The Xarantines, however, had bonded a carbon dioxide-based neurotoxin to a unique molecule of the ale. After the Klingons had consumed the ale, they became unconscious and would have died within one or two days, but Phlox developed an antidote. ()

In 2153, Doctor Phlox gave Captain Jonathan Archer a hypospray filled with a neural toxin and asked him to use it against Phlox when he turned into a cybernetic creature. This toxin would terminate his synaptic functions within seconds. ()

Trellium-D was a potent neurotoxin to the Vulcan nervous system. ()

A substance produced by Xindi-Insectoid eggs was a mild neurotoxin to the Human nervous system. Jonathan Archer was  with this neurotoxin in January 2154; in addition, this substance also subconsciously forced him to care for the eggs like a Xindi-Insectoid. ()

In 2371, the Kazon used a nerve toxin to kill one of their own who was gravely injured while attempting to integrate a Federation replicator into a Kazon vessel. It was injected through the use of a needle projecting from a ring. ()

In a hallucination caused by a non-corporeal lifeform in 2373, Kathryn Janeway saw The Doctor use a neural toxic gas to euthanize her after diagnosing her with the Phage. ()

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de:Nervengift
 Neurotoxin