Constitution
Healthy
You are healthy and cured.
Weakened
The victim takes a –2 penalty to Fortitude saves, Constitution checks, and Constitution-based DCs. Every time the victim attempts a Fortitude save against the poison—whether he succeeds or fails—he loses Hit Points as per on initial exposure.
Impaired
The victim takes an additional –2 penalty to the affected checks, and the DCs of his spells and special abilities decrease by 2.
Debilitated
Strenuous actions cause the victim pain. If he takes a standard action, he immediately loses 1 Hit Point.
Unconscious
The victim is unconscious and can’t be woken by any means.
Dead
The victim dies.
Source
Core Rulebook pg. 415