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here is a table for interesting poison/toxin effects...
3:You fall unconscious. 0 hp.
4: Diarrhea. It's bad. Very bad. You try and step back but slip in it and fall to the ground. (if in combat) next melee attack misses you. (henchman loyalty check time).
5: You drop your weapon and injure yourself (1/2 weapon damage)
6: Your [bodily appendage] begins itching and burning as if it is on fire. Large blisters appear over the next 10 minutes. (Effect on combat determined by appendage affected.)
7: You are exceptionally dizzy and misstep as you attack. (+ for enemies to hit you)
8: You begin shivering and shaking uncontrollably causing the contents of your pack to spill about all over the ground. (Environmental hazards dependent upon pack contents)
9: You blink and shake your head. Everything is blurry and duplicated (- to hit)
10: You begin projectile vomiting (stunned 1 minute, - to hit)
11: Diarrhea. It's bad. Very bad. (henchman loyalty check time)
12: Your tongue swells up to three times its normal size and turns a lurid color of puce. (cannot speak)
13: You feel woozy and fall down.
14: You drop your weapon.
15: Large purple blotches begin to appear on your skin. They itch like mad. (distracted, cannot attack, + to be hit, half movement speed)
16: You become despondent. Nothing matters any more. You're chilled and your stomach really hurts. (morale check, may drop weapon and attempt to leave the field of battle) 
17: You begin projectile vomiting, but manage to maintain your focus and weaponize it (if in combat). Additionally, you've consumed nothing but red wine today. Morale checks for creatures with less HD than you.
18: You blink and shake your head. You see halos of light around *something*. (Can function as a plot device or reward (lead to treasure), or act as detect good/evil, detect alignment, detect magic, etc)