Good communication is central to psychiatric consultation. It informs assessment, diagnosis and treatment, and is an important part of empowering people to take more control of their own mental health. But active listening and personally tailored explanations may require additional skills and may need to be practised in the context of ethical and legal frameworks. In this article we consider the additional impairments that occur in people with intellectual disabilities who use psychiatric services and describe practical steps that can be taken by clinicians and service providers to overcome these impairments, to make reasonable adjustments and to ensure that patients obtain maximum benefit from services.