- Patients who are receiving any of the following concomitant Crohn's disease medications must have been on a stable dose of these medications for the specified period of time PRIOR TO confirmation of eligibility (this time period may include screening): aminosalicylates, antibiotics, and immunosuppressants (i.e., 6 MP, MTX, or AZA) for at least 4 weeks; corticosteroids or PO budesonide for at least 2 weeks; anti-TNF agents (i.e., infliximab or adalimumab) for at least 8 weeks.