- Use of the following treatments: TNFi agents within 12 weeks, etanercept within 8 weeks, leflunomide without cholestyramine wash-out within 8 weeks, systemic non-biologic medications for psoriatic arthritis or psoriasis and photochemotherapy within 4 weeks, intraarticular injections (including steroids) and intramuscular or intravenous corticosteroid treatment within 4 weeks, topical psoriasis medications and phototherapy within 2 weeks, low and high potency opioid analgesics within 2 weeks prior to randomisation