Urticaria
"I developed CIU approximately 4 months ago, and have never gone a day without extensive hives except when on prednisone, and the first 3 weeks after my first Xolair shots.  Since then, I have had two more rounds of Xolair, but the hives are not going away, and I&#039;m terribly disappointed.  Have not given up the other antihistamines prescribed by my allergist.  Does anyone know how long Xolair takes before it starts knocking out the hives?"