In Third Girl (1966) by Agatha Christie, the character Dr Stillingfleet describes the condition of his patient:
“She’s down at Kenway Court. Came like a lamb. Can’t tell you much yet. The girl’s full of drugs. I’d say she’d been taking purple hearts, and dream bombs, and probably L.S.D.… She’s been all hopped up for some time. She says no, but I wouldn’t trust much to what she says.”
What is a “dream bomb”? I would have guessed that it was an invention, except that “purple heart” really was 1960s drugs slang:
purple heart, n. 3. British colloquial. Originally: a tablet of the drug Drinamyl, containing dextroamphetamine and amylobarbitone (in reference to its colour and shape). Later also: a tablet of any amphetamine.
Oxford English Dictionary