Antipoison Potion is a potion made through the Herblore skill. To make an Antipoison Potion you must have a Herblore level of 13 or higher. Antipoison potions completely cure poison right away. To make an Antipoison Potion you need to spawn a Marrentill Potion (Unf) (::item 93) and Unicorn Horn Dust (::item 235) and use the Marrentill Potion (Unf) on the Unicorn Horn Dust.