So you made your save vs. poison....

d12
1. Hands swell to gross immensity
2. Full body numbness: -2 to all physical tasks, bonus to hit points
3. Narcoleptic effect: 1 in 6 chance of involuntary napping/turn
4. Loss of mental acuity: disallows spell casting and other heavy-duty cognitive activities
5. Astonishing gastrointestinal distress: 1 in 6 chance of attack/turn
6. Overtaxed liver produces mind-bending abdominal pain
7. The shakes: -2 to everything requiring manual dexterity
8. Skin changes to random color and hurts like hell
9. Hallucino-vision: -2 to everything requiring visual accuracy, occasionally terrifying
10. Speech center compromised: drunken caveman talk
11. Copious drooling: suavity nullified
12. Brief coma followed by total emotional meltdown w/inconsolable weeping, irrational behavior, sudden freak-outs

Notes: effects last anywhere from 1d4 hours for relatively mild toxins to 1d4 weeks for extremely potent poisons or large doses