Poison not blocking regeneration?

Hello,
Is anyone else having a problem using poison? I use it on a monster, it says its poisoned, i go to regen my health so i can kill it and when i come back its at full health.
I tried it on various stages and the class challenges but it doesn't seem to work anywhere?
Thanks,
Shawn
Is anyone else having a problem using poison? I use it on a monster, it says its poisoned, i go to regen my health so i can kill it and when i come back its at full health.
I tried it on various stages and the class challenges but it doesn't seem to work anywhere?
Thanks,
Shawn