Drug Generator

I suppose you could also use this for any sci-fi setting, really.

Toxin-4 is a very weak depressant. It's a sparkling violet gas that is sniffed from an aerosol. It makes you mentally numb. One dose lasts for an hour or two. Side effects can include a burning sensation over your entire body, trouble sleeping, and reduced ability to feel pleasure when not high. It's easy to find.