Causes physical damage. When a target is injured by the arrow it will be poisoned for 33 turns (4 seconds per turn). Poison damage starts at 3 HP for 4 turns, followed by 9 turns with 2 HP and 20 turns with 1 HP each, which adds up to 50 HP over a period of 2 minutes and 12 seconds.
An article from Tibianews, published on October 21, 2007, suggested that the attack rate for Poison Arrow is 22. Previously it has been believed that the attack rate is 20.