Lewy body dementia is a heterogeneous condition that is often difficult to treat. It is associated with higher rates of neuropsychiatric symptoms, inpatient admission and carer stress, as well as shorter survival, than other dementia subtypes. Core clinical features are: fluctuating cognition with pronounced variations in attention and alertness; recurrent visual hallucinations; REM sleep behaviour disorder; one or more features of spontaneous parkinsonism. Recurrent visual hallucinations occur in up to 80% of patients.