Has anybody had the experience of IVIG for MG causing Stiff Person Syndrome symptoms through raised GAD65 Ab (antibodies)? I admit to never having been the most physically relaxed person, even before IVIG, and many of the "typical patient profile" descriptions have long been true, but my spasms have gotten markedly worse since starting IVIG treatment a year ago for Myasthenic crisis.

I'm starting on Baclofen after Flexoril was a big 0. Getting another antibody test at the end of this IVIG cycle.

Has anyone had this happen *from* IVIG? Does anyone know what the deciding factor is in telling if one is causing the other, or if I do truly have SPS in adddition to MG?