Probably not. As Remus Lupin says in Deathly Hallows, polyjuice potion is only meant for human use. It would not work properly with a part-human like a werewolf or half-giant ( half-breeds as Delores Umbridge calls them). Although when Hermione drank the polyjuice potion of a cat in Chamber of Secrets, she turned partly into a cat... so if you drank a werewolf spiked polyjuice potion, I would assume you would take some characteristics of the wolf. However, the effects of a magical being would most likely be different then a mundane being like the cat.