This spell has a duration measured in days rather than hours. When cast upon a victim who has been poisoned by any means, hold poison arrests the venom and prevents it from doing any additional damage to the victim. (In most cases, the spell must be cast during the poison's onset time in order to be effective.) Damage that has already been inflicted is not restored, but as long as the hold poison is in effect, the victim can be cured or healed of damage causes by poison by any normal means.
