I have a character using a poisoned dagger to assasinate another character (might as well give them names; Angelique is stabbing Michel.) I need to decide what kind of poison to use. The setting is secondary world steampunkish setting, so I can play around with things somewhat, but even in fantasy, if I were to use a plant poison, there'd be somebody that would know that wouldn't work.
The other thing is, part of the plot reason for this is Michel needs to be thrown into some kind of delerium where he's talking and doesn't know what he's saying, and unknowingly tells another character something he wouldn't if he were in his right mind.
The last thing is, he needs to survive, preferably with little or no permanent damage.
As far as I have been able to find, an animal derived toxin works best for a blade, since plants mostly need to be digested. Batrachotoxin (poison dart frog) appeals to me because apparently it remains active on the blade for over a year, and I plan to have the same knife used again, and the wielder then won't have had a chance to repoison it. Apparently it's the most potent poison there is and takes effect within a minute, kills within a few minutes, but I figure if he caught on early and ended up only scratched a bit, I can fudge, since there's lots of different frogs with different potencies of poison, and this frog would be made up anyway.
Mainly what I need to know is if it would be plausible for poison from a frog or newt to cause delerium, or if there's another poison that I'm missing that would suit the plot better. And the other thing I need to know are the symptoms of whatever poison, so I can describe it in the scene, and the time for recovery; all I've been able to find is convulsions and muscle weakness, and the time to onset of symptoms. Would he be off his feet for a matter of hours, days, or weeks? And how long would it be before they'd be sure whether or not he was going to live?