The Alzheimer's Society is the UK's leading care and research charity for people with dementia, their families and carers. They produce information and advice sheets to support those affected by dementia. People with dementia may at some point in their illness develop symptoms such as depression, restlessness, aggressive behaviour and psychosis (delusions and hallucinations). While it is important to try to understand and address the underlying reasons for these problems, it may be necessary at times to prescribe medication if the symptoms are distressing, persistent and have not responded to psychological treatments. This information sheet describes the different types of drugs that may be prescribed.