Cost-of-illness analysis of ulcerative colitis patients treated with biological therapy: a prospective observational study in Iran.

Background: No research has assessed the comprehensive annual costs of managing ulcerative colitis (UC) patients undergoing biological treatment. This study aimed to determine the annual costs and primary cost drivers for UC patients receiving biological therapy.

Methods: This prospective observational study was conducted in Iran from a societal perspective, employing the cost-of-illness method, grounded in human capital theory.