Addiction and mental health disorders are deeply intertwined often co occurring and exacerbating one another through shared neurobiological pathways and psychosocial factors. Traditional treatment approaches, which address each condition separately, have produced limited outcomes. This article synthesizes evidence from clinical literature, policy analysis, and case studies to present a holistic integrative framework for managing co occurring disorders. The framework combines comprehensive assessment, integrated treatment planning, trauma informed care, recovery capital development, and a continuum of care delivered through multidisciplinary teams. Three case studies — an urban community health center, a rural telehealth program, and a criminal justice system initiative — illustrate the adaptability and impact of the model. Findings indicate that integrated approaches improve treatment retention, reduce relapse rates, and enhance functional recovery while lowering costs and reducing stigma. Implementation challenges include systemic fragmentation, funding constraints, and workforce capacity gaps. Policy and practice implications focus on regulatory reform, investment in interdisciplinary training, and leveraging digital health tools. Adoption of the proposed framework could significantly advance recovery outcomes and reduce the societal burden of cooccurring addiction and mental health disorders.