This paper has been compiled in response to an MLA request on the complex issue of ‘dual diagnosis’ in the context of service provision. Specifically, the paper provides the following:

• An overview of dual diagnosis.
• Estimated prevalence rates.
• The impact of dual diagnosis on people’s lives.
• Types of services available and challenges in terms of accessibility.
• Recommendations for service delivery.
• The policy context in Northern Ireland and neighbouring jurisdictions.