Overview Effect of Anti-IgE in Chronic Urticaria Status: Completed Trial end date: 2007-09-01 Target enrollment: Participant gender: Summary This study is being done to find out if a drug called Xolair (omalizumab), an anti-IgE antibody, is safe and effective for people with chronic urticaria (hives) with persistent symptoms in spite of taking antihistamines. Phase: Phase 2 Details Lead Sponsor: Johns Hopkins UniversityCollaborator: Genentech, Inc.Treatments: Omalizumab