This research delves into the significance of transitioning from intravenous (i.v.) to subcutaneous (s.c.) administration of biologics in enhancing patient convenience and treatment outcomes. It emphasizes the role of model-informed drug development (MIDD) in facilitating this transition, providing insights into crucial clinical pharmacology and regulatory considerations. Key aspects highlighted include comprehensive pharmacokinetic evaluations, exposure-response profiling, comparability studies, and safety assessments, with MIDD strategies aiding in expediting the shift to s.c. dosing, thereby improving patient adherence and clinical efficacy.