Brompton Cocktail is the seventh song on Avenged Sevenfold’s fourth, self-titled studio album. It is considered experimental metal and was written by the Rev and M Shadows.

Lyrically, the song is about a dying person in the last stage of a severe illness. The lyrical “I” has come to accept that they are going to die and begs their doctor for a shot of Brompton Cocktail, which is an elixir meant for use as a pain suppressant for terminally-ill patients to maintain sociability near death. They know they are dying and want to leave pain-free and feeling alive.

It is made from morphine or diacetylmorphine (heroin), cocaine, highly-pure ethyl alcohol. These substances (or at least substances that are a lot like them) were found in The Rev’s system during the toxicology examination.