This non-interventional study examines whether the patient's level of information and the consideration of the patient's preference have a positive effect on the compliance and thus also on the therapeutic success.

Inclusion Criteria:

• Patients are treated for the first time with oral PENTASA®, e.g. following first diagnosis of ulcerative colitis for treatment of an acute episode or
• Following a therapy-free period (no previous mesalazine therapy) or due to poor response or underdosage oder lacking acceptance of the previous medication the patients are re-adjusted to oral PENTASA®,
• The patients (≥ 18 years) have been informed about the NIS and have given their written consent for participation.

Primary care facilities