In Genre Fantasy, potions are generally not simple medicines or poisons but Spells in liquid form, brewed by a Witch or Wizard: a potion of Healing is understood to act not medically but magically. Other established potion effects include Amnesia, Transformation, sleep, involuntary Love-fixation, temporary Invisibility or Invulnerability, and general loss of free will (>>> Debasement). Lewis Carroll's "DRINK ME" potion in Alice's Adventures in Wonderland (1865) reduces Alice to a height of ten inches; Asterix's tiny Gaulish village defies the might of Rome thanks to a potion of strength; the Yellow Adept in Piers Anthony's Apprentice Adept sequence is a potion specialist with a brew for every need. [CB/DRL]
see also: Elixir of Life.