h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

This is the cure for the curse of Lycanthropy(Werewolfisim)handed down from generation to generation,origin unknown.
You must eat reptile meat.Aligator,Crocodillian,or serpentine.
As the Werewolf is undoubtably of noble decent, the reptile meat must be prepared, cooked and presented to the afflicted by his servant.
The reptile must offer himself for sacrifice to the werewolf while he is in human form and the reptile must not be hunted but rather stumbled upon. A special blessing must be made before the supper thanking the kind serpent for offering itself for the purpose of reversing the curse and to the deity, begging for his aid in the removal of the beast within and to be restored to a normal human being.After the meal is finnished another thanksgiving prayer is to be offered in supplication to the hallowed named for canceling the hex and lifting the spell.When this is done the person will be whole again.

Thanks for the info!
There's another way. I'll hunt it down and post it for you.

From an older entry:

If all else fails, and you've got a werewolf to de-wolf, you don't necessarily have to kill him. Just get him into a church, then take a sprig each of ash, white poplar and birch, and bind them together with red ribbon, forming a wand. Set some Holy Water on to boil while praying, then dip the wand into the water. Slap the werewolf in the face with the wet wand, and say, using the proper dramatic voice, "In the name of the Blessed Lady, Be gone! Depart! Black, Evil Devils from Hell, Be gone!" Do this three times, then curse at the wolf and revile him three times.

If that doesn't do it, shoot him