Green’s Dictionary of Slang

(drugs) a prescription (cf. script n.).

1928		R. Fisher Walls Of Jericho 217: Drop in on one of these new young doctors that had to write ‘scrips’ to make it.
1938		D. Maurer ‘Lang. of the Und. Narcotic Addict’ Pt 2 in Lang. Und. (1981) 108/2: scrip. Var. script. A prescription for narcotics.
1958		A. King Mine Enemy Grows Older (1959) 22: My new-found friend knew another croaker who wrote scrip for junkies.
1968		‘Sl. of Watts’ in Current Sl. III:2.
1972		N.Y. Times Mag. 2 July 9: [They] had for some time been able to purchase heroin through venal ‘scrip’ (prescription) doctors in Greenwich Village.
1981		H. Gould Fort Apache, The Bronx 311: He couldn’t even use strong painkillers like percodan because you had to show a scrip for them.
1989		(con. 1940s) Courtwright & Des Jarlais Addicts Who Survived 89: That’s when a lot of drugstore and hospital burglaries started coming into play. I made croakers, too. I even stole a few scrips.
1991		D. Widgery Some Lives! 165: I write a scrip for 300.
2006		F.X. Toole Pound for Pound 127: Go see your croaker to write you a scrip.
2017		D. Winslow The Force [ebook] An Upper West Side doctor writes Malone scrip for anything he wants—Dex, Vicodin, Xanax, antibiotics, whatever.