It wouldn't have any effect. If the opponent was a natural lycanthrope, he cannot be cured. If his lycanthropy was a result of being bitten by a werewolf, it can be cured, but not in this manner. The MM (pg.219) section on curing lycanthropy says that a "remove disease or heal spell cast by a cleric of at least 12th level also cures the affliction, provided the character receives the spell within three days of the lycanthrope's attack." Otherwise a remove curse or break enchantment is required.