A tranquilizer (US), tranquillizer (Oxford spelling), or tranquilliser (UK; see spelling differences), is a drug that induces tranquility in an individual.
In the James Bond film 'Octopussy', Octopussy (Maud Adams) and her team use BSA Scorpion pistols loaded with tranquilizers to fight off Kamal's men.
An examination of pilot Pavel Gruzin's body revealed traces of the tranquilizer Phenazepam in his muscle tissue.
BFRO then see Cartman and think he is a real life "Bunny-Man", so they shoot him with a tranquilizer and hope to make an Animal Planet program documenting their capture, but instead of taking Cartman as their evidence, they take the gun with which they shot him.
Etorphine (a.k.a. Immobilon or M99), a veterinary tranquilizer
Marvin's purpose for capturing Bugs (with what Marvin explains is an "ACME Super Rack and Pinion Tranquilizer Carrot") is to provide a playmate for Hugo the Abominable Snowman (from 1961's The Abominable Snow Rabbit).