Green’s Dictionary of Slang

1. (also tranq, tranx) any type of tranquillizer; also attrib.

1976		M. Braly False Starts 356: An MTA issued them tranqs.
1976		Maclean’s (Toronto) 22 Mar. 58: The Canadian Medical Association has officially expressed ‘alarm’ about over-prescriptions of minor tranks, and their abuse by consumers.
1981		H. Gould Fort Apache, The Bronx 235: A ‘trank’ would only make him lose his edge.
1992		I. Rankin Wolfman 135: He doubted she’d get much sleep for the next night or two, tranqs or not.
1996		P. Howard The Joy (2015) [ebook] ‘You spend a couple of nights in The Joy and I promise you you’ll need something a bit stronger than tranks to get you through the day’.
2001		J. Stahl Plainclothes Naked (2002) 224: The Divine Being he imagined ruled the universe, a sympathetic, slightly crazed diva, like Judy Garland in her tranq-plagued later years.
2002		‘Drug Sl. Vault’ on Erowid.org 🌐 Tranx Tranquilizer.
2002		J. Cameron Hell on Hoe Street 6: Noreen you want a trank? You got brain fever?
2005		E. Weiner Big Boat to Bye-Bye 185: ‘It wasn’t me. I took a Mickey finn’ [...] ‘That trank story?’ He sneered.
2012		R. Milward Kimberly’s Capital Punishment (2023) 481: The tranx is like a tickly sickly snake.

2. phencyclidine [used non-recreationally as an animal tranquillizer].

2001

ONDCP Street Terms 21: Trank — PCP.