Anaesthetic

Anaesthetic was a drug able to sedate living beings, used on Earth and other planets.

Earth
It was used by Grace Holloway on the riddled and dying Seventh Doctor, in a failed attempt to save him through a major operation. The regeneration process came hours after the death, aggravated with a temporary amnesia; the Eighth Doctor ascribed such side effects to the anaesthetic. (TV: Doctor Who)

Extraterrestrial uses
The Master employed sleeping gas in the alarm system of his TARDIS. It was scattered in the console room after the Third Doctor had stolen its dematerialisation circuit. (TV: Colony in Space)

On Alzarius, chief scientist Dexeter administered anaesthetic to a Marshman in order to sedate and vivisect him. (TV: Full Circle)