From Wookieepedia, the Star Wars wiki.

Nerve gas being used.

Nerve toxin, also know as nerve gas, was a paralyzing gas poison. Such toxic agents were employed by bounty hunter. Boba Fett carried darts with a nerve toxin, which he once used in a fight against Jodo Kast; Fett also kept the antidote for the toxin on his person. Rebel Alliance troops also used non-lethal gas that incapacitated an enemy for a limited duration of time.

Appearances

• Rebel Force: Target
• Boba Fett: Twin Engines of Destruction (First appearance)

Sources

• Star Wars Galaxies Trading Card Game – Squadrons Over Corellia (Card: Nerve Gas)
• Star Wars Galaxies Trading Card Game – Squadrons Over Corellia (Card: Neurotoxin)