Jim's doctor told us that even though the Baclofen or Tizanidine isn't controlling the spasms completely, they both cause weakness. The more you take, the weaker your legs will be. Especially with Baclofen. He said that's why they do not like giving large doses for those still walking because it can do this. On the bright side, Tizanidine can actually give you energy. Weird huh?