<prompt> All of the following are used for treatment of stiff person syndrome, EXCEPT:DiazepamValproateIV IgNone of the above  <response>: Optimal treatment of stiff-person syndrome requires therapy of the underlying tumor, glucocoicoids, and symptomatic use of drugs that enhance GABA-ergic transmission diazepam, baclofen, sodium valproate, tiagabine, vigabatrin. A benefit of IVIg has been demonstrated for the nonparaneoplastic disorder but remains to be established for the paraneoplastic syndrome. Ref: Harrisons principle of internal medicine 17th edition, chapter 97 