Green’s Dictionary of Slang

percodan.

1971		Illinois Legislative Investigating Committee Drug Crisis in Spears (1986).
1981		D.E. Miller Bk of Jargon 338: perks: Percodan.
1985		E. Leonard Glitz 333: Cocaine, percs, ludes ...
2000		Observer Mag. 27 Feb. 23: If you get some valium, some percs, pills or anything like that.