- Patients must have an inadequate response and continue to have moderately to severely active disease while on current or previous treatment with at least one agent from both of the following groups: methotrexate (greater than or equal to 15 mg/week, or maximum tolerated dose) or leflunomide (20 mg/day, or maximum tolerated dose) for at least 12 weeks prior to screening; etanercept ( greater than or equal to 25 mg/2 x week SC, or maximum tolerated dose) for at least 12 weeks prior to screening, infliximab (greater than or equal to 3 mg/kg IV, or maximum tolerated dose) for at least 14 weeks duration prior to screening, or adalimumab (greater than or equal to 40 mg SC every 2 weeks, or maximum tolerated dose) for at least 12 weeks prior to screening.