- All subjects must have been receiving treatment with a minimum dose of 15 mg per week of Methotrexate for at least 12 weeks and at a stable dose for 28 days prior to screening. A dose as low as 10 mg Methotrexate is permitted if 15 mg could not be reached, due to toxicity. In Japan, Korea and Taiwan, a minimum dose of 7.5 mg per week is permitted. Additional treatment with Hydroxychloroquine or Chloroquine is permitted, if it is at a dose approved for the treatment of RA and the dose has been stable for at least 28 days prior to screening