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)

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