Anesthesia gas
Anesthesia gas, or neural gas, was an anesthetic drug available – in gaseous form – during the 22nd century.

In 2151,  was attacked by a Ferengi vessel that flooded Enterprise with anesthesia gas. This was an attempt to steal all the items of value and the females on board, as the Ferengi starship's crew intended to sell them for a profit. ()

By the 23rd century, anesthesia gas was available to  starships in the . In 2267, Commander Spock and Captain James T. Kirk flooded almost all decks on the  with anesthesia gas to retake the ship from Khan Noonien Singh and a group of Augments led by him. ()

de:Neuralgas
Drugs