Infliximab Biosimilar "Pfizer" Drug Use Investigation (Crohn's Disease or Ulcerative Colitis)

This study will be conducted with all-case investigation system in patients with Crohn's disease or ulcerative colitis.

This study will be conducted in patients who used this drug after the day of approval of dosage and administration for Crohn's disease or ulcerative colitis at contracted medical institutions. Patients who used this drug before conclusion of the contract with the medical institution will also be included in this study (retrospective patients will be included).

Therefore, Time Perspective is retrospective and prospective.