You must hold an elixir, infused extract, Poison, or potion in hand as you cast this spell. The held substance drains from its container into a magical sac in your body. While the spell lasts, you can deliver the substance with a mere touch. To do so to an opponent, you must make a successful melee touch attack. If you hit, the substance takes effect immediately, despite any onset period, and that opponent receives the normal Saving Throw (if any) against the substance. If you miss, the substance remains in the magical sac for you to use later.

This spell protects you from Poison in the sac, but unless you have the Poison use class feature, you suffer a 5% chance of exposing yourself to the Poison when you first cast the spell. If you roll a natural 1 while attempting to inject the Poison into an enemy, you are exposed to it.