A potion is a magic liquid that produces its effect when imbibed. Potions are also sometimes called elixirs.
Magic oils are similar to potions, except that oils are applied externally rather than imbibed.
A potion, oil, or elixir can be used only once. A typical potion or oil consists of 1 ounce of liquid held in a ceramic or glass vial fitted with a tight stopper. The stoppered container is usually no more than 1 inch wide and 2 inches high. Vials hold 1 ounce of liquid. Drinking a potion or applying an oil requires no special skill.