- Nonsteroidal antiinflammatory drugs (NSAIDs), selective cyclooxygenase-2 (COX- 2) inhibitors, oral corticosteroids (≤ 10 mg of prednisone, or equivalent, daily) or low dose opioids (≤ 30 mg of oral morphine, or equivalent, daily) must be stable for ≥ 28 days prior to screening,