Many medications prescribed for rheumatoid arthritis can weaken the immune system, including prednisone, methotrexate, and, of course, the biologic agents such as Humira, Enbrel and Remicade, to name but a few. The use of these medications can make a patient more susceptible to the H1N1 virus (the so-called swine flu) and the regular seasonal influenza. And if a patient on an immunosuppressive drug does contract such a viral illness, there is a much higher risk of developing more severe-and...
