Tranquilliser gun
From Tardis Wiki, the free Doctor Who reference
Tranquilliser guns, also referred to as tranq guns, were guns which were used to sedate small animals.
Settlers on the planet Sunday carried tranq guns, and Professor Ty Benson used one to capture a Sundayan otter which was under the control of the Swamp monster. (PROSE: Wetworld)
The Space Security Service Gamma Team carried these while entering the petrified jungle on Station 7. Tranter stated that one could "stop a Slyther in its slime." Sanders attempted to use one against a Varga plant-infected human but was killed by Unit Three before he could do so. (COMIC: The Only Good Dalek)