"Wolfsbane Potion is a relatively recent discovery that allows werewolves to remain safe during the full moon. A complex potion, it must be drunk during the week preceding a full moon. The potion allows the werewolf to keep their human mind after the transformation, so they are able to wait for the moon to wane as a harmless wolf. Severus Snape makes the Wolfsbane Potion for Remus Lupin whilst the latter is a teacher at the school."