Green’s Dictionary of Slang

1. barbiturate, esp. seconal.

1980

E. Folb Runnin’ Down Some Lines 168: Other expressions likened Seconal to ‘candy’ (itself a vernacular term for heroin or pills of any type) – M & Ms, gum drops, ju jus.

2. any kind of drug available in pill or capsule form.

1980

E. Folb Runnin’ Down Some Lines 241: gumdrop [...] 2. Any kind of drug in tablet or capsule form.