Registry-Based Studies in Psychiatry: Advantages, Challenges, Applications, and Future Directions a Narrative Review

Psychiatric disorders contribute substantially to global morbidity and disability, while traditional randomized controlled trials (RCTs) often lack generalisability due to restrictive designs and limited follow-up. Registry-based studies have emerged as a complementary approach, leveraging real-world data to address these limitations.To synthesise the conceptual foundations, methodological approaches, applications, advantages, challenges, and future directions of registry-based studies in psychiatry, and to evaluate their role alongside conventional RCTs.A narrative (integrative) review was conducted following Sukhera (2022) guidelines. Literature from PubMed, Scopus, and Google Scholar (1990–March 2026) was systematically searched using terms related to registry-based research and psychiatry. Key methodological and application-focused studies were selected through iterative screening and citation chaining.Registry-based studies utilise routinely collected clinical and administrative data to enable large-scale, longitudinal, and population-level psychiatric research. They support diverse designs, including cohort studies, case-control analyses, and registry-based randomized controlled trials (rRCTs). Major advantages include high external validity, large sample sizes, cost-effectiveness, and long-term follow-up. Key challenges involve data quality, diagnostic validity, confounding, limited psychosocial variables, and ethical considerations. Applications span epidemiology, treatment outcomes, risk prediction, and health systems research.Registry-based studies are a powerful complement to traditional RCTs, bridging the gap between controlled evidence and real-world psychiatric practice. Advances in digital health, artificial intelligence, and global registry infrastructure are expected to enhance their impact, particularly in advancing precision psychiatry and equitable mental health research.