SAN DIEGO--(BUSINESS WIRE)--Santarus, Inc. (NASDAQ: SNTS) today announced that it has begun patient enrollment in a multicenter, randomized, double-blind, placebo-controlled Phase IIIb clinical study with the investigational drug UCERIS™ (budesonide) tablets 9 mg to evaluate whether there is an incremental benefit when UCERIS 9 mg is added to current oral aminosalicylate (5-ASA) therapy for patients with mild or moderate active ulcerative colitis who are not adequately controlled on background 5-ASA therapy.