What is "thiopentone"

Usage examples of "thiopentone".

He could barely understand what William was saying, but at last he nodded his head, and with trembling blood-smeared hands made up a hypodermic of thiopentone sodium.

It was based on a variation of thiopentone that had been developed by a member of the Order, and worked not only as a general muscle relaxant and reflex suppressor, but simultaneously broke down the will, leaving the target utterly susceptible to suggestion.