Yeah, you're thinking of promenthazine (purple) and hydrocodone (yellow). If you dip a blunt in either, you'll get so fucked up. Or add some to some sprite or sprite remix, add a jolly rancher (or alcohol, but its not advised to do so), and just sip on that. It'll get you leaning right, I've never done it, but yeah.

If you want some OTC shit, do DXM. Coricidin Cough and Cold, or Dexalone, or Vicks 44.