(ignore the rudeness from tina fey^) no part of her powers is that she is immune to all toxins

^ Ivy's Creation is correct. Poison Ivy is immune to virtually all substances that would otherwise be considered toxic or harmful, no matter what they are, so this would include anti-toxins. My guess is that even if an enemy created an anti-toxin specifically from the poison in her bloodstream and attacked her with it, her body's natural defenses would instantly form an immunity to it. 
 
Interesting question though.

i wasnt even aware that her blood was toxic, but i've never read too much on her or known much period.     
 
@Zoom said:

"I'm sorry.  We don't speak random capitalization.  Try again in regular English this time. "

wow.  that response made this feel so much more like a true fan community.  not only was ur response irrelevant, but u attack him as well.  i mean hell, u didnt even include an "lol" to at least make it even appear somewhat friendly or jokey in manner lol.