Does Poison (Ex) stack?

[Jagael]

I know manufactured poisons can stack, but I'm having trouble tracking down if the Poison monster ability stacks with itself.

I have 2 Giant Centipedes that both hit one PC. Is he suffering from one instance of Poison? One that has a higher DC? Two?

Any help or reference would be welcome.

[avr]

If the PC fails the first save, the second save will be at 2 higher DC, and if the second save fails the PC will be facing a single poison with 2 higher DC from that point. FAQ

[Cavall]

avr is correct they do stack.

[Jagael]

Thank you! Poor, poor player.