Laudanum

Laudanum was a drug.

Opium could be mixed with brandy to make laudanum. (PROSE: The Eight Doctors)

The Sixth Doctor had a pill he picked up as a hangover cure from Zanthas IV which successfully counteracted the effects of laudanum. (AUDIO: Catch-1782)

Both Percy Shelley and Mary Shelley used laudanum, sometimes in large quantities. (AUDIO: Mary's Story, AUDIO: The Silver Turk)