 Struggling with moderate to severe Crohn's disease or ulcerative colitis? Talk to your doctor about number one prescribed, Antivio, offering two maintenance options, including the Antivio Pen. Infusion and serious allergic reactions can happen during or after treatment. Antivio may increase risk of infection, which can be serious. PML, a rare, potentially fatal brain infection, cannot be ruled out. Tell your doctor if you have an infection, flu-like symptoms, sores, or are prone to infections. Liver problems can occur. Antivio, relief, remission, for real.