Possible Duplicate:
Has anyone actually cured lycanthropy?
How to get cured of werewolfism? I don't want to be werewolf anymore.
Possible Duplicate:
Has anyone actually cured lycanthropy?
How to get cured of werewolfism? I don't want to be werewolf anymore.
You should be able to cure your lycanthropy after completing all of the "main" Companions quests, if you wish to do so.
Spoiler:
It is done inside the Tomb of Ysgramor (same place you cure Kodlak), and I believe you need to be carrying an extra Glenmoril Witch head for yourself (you can get these during one of the quests).