What would be the effects if someone was moderately poisoned?

Like, not enough to kill them but enough so it would affect them in some way.
If someone was to drink something that had been poisoned, how would they actually feel/see?
I've been trying to look it up, but almost everything I can find seems to be more from the perspective of what another person would see, and not what the person being poisoned would feel like/experience.

Other webpages or links are fine as answers! Thank you!

Maya2013-02-22T21:57:37Z

Favorite Answer

vomiting, nausea, blacking out, temporary blindness or blurred vision, headache. burning sensations (like of the lips/tongue/mouth), head pounding sensation, maybe hearing things that are not there, stomach ache, trouble speaking, body numbness, difficulty breathing, difficulty walking, can't remember things, phantom pain, feeling like you are going crazy, maybe paralysis, heart racing