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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Behavioural and psychological symptoms of dementia

Psychiatry · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

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Acute behaviour change may signal dangerous illness

Sudden agitation, withdrawal, hallucinations, reduced intake or altered arousal with hypoxia, infection, pain, retention, constipation, hypoglycaemia, injury, stroke signs, seizure or medicine toxicity requires urgent medical and delirium assessment rather than behavioural containment.

Action: Assess ABCDE, glucose, observations, attention and focal neurology; obtain baseline and onset; address pain, toileting and sensory needs; review medicines; and treat likely causes in parallel. Use calm one-person communication and proportionate observation, escalating emergency medical or mental-health support for immediate harm risk.

Synopsis

Interpret distress and behaviour as communication, identify delirium and remediable clinical or environmental causes, deliver personalised psychosocial care, and restrict antipsychotics to NICE-defined severe distress or harm-risk situations.

  • Agitation, aggression, calling out, wandering, resistance, apathy, sleep change, hallucinations, delusions and anxiety are descriptions requiring formulation, not diagnoses to suppress.
  • Define exactly what happens, when, with whom and what precedes and follows it; vague labels such as challenging conceal useful triggers.
  • NICE requires structured assessment for pain, delirium, inappropriate care and other clinical or environmental reasons before treatment for distress.
  • Offer psychosocial and environmental interventions as initial and ongoing management, matched to communication, history, culture, sensory ability and preferences.
  • Personalised activities should promote engagement, pleasure and interest for agitation or aggression rather than merely occupy time.
  • Only offer an antipsychotic when the person risks harming themselves or others, or agitation, hallucinations or delusions cause severe distress.
  • Discuss benefits and harms, use the lowest effective dose for the shortest possible time, reassess at least every six weeks and stop without clear ongoing benefit.
  • Risperidone's UK licence is narrow: up to six weeks for persistent aggression in moderate-to-severe Alzheimer's disease after non-drug approaches and with harm risk.
  • Do not offer valproate for agitation or aggression in dementia unless it is indicated for another condition.
  • Continue psychosocial care during and after medication; sedation is not evidence that fear, pain, boredom or unmet need has resolved.

Key red flags

Hours-to-days fluctuation in attention or arousal is delirium superimposed on dementia until acute causes have been assessed and treated.

New focal neurology, seizure, head injury, severe headache, reduced consciousness or abnormal physiology needs an emergency medical pathway.

Pain, urinary retention, faecal impaction, dehydration, hunger, infection and medicine withdrawal can present primarily as distress or aggression.

Immediate risk of serious harm to the person or others requires a least-restrictive safety response while causes are investigated.

Rigidity, fever, dysphagia, marked sedation or autonomic instability after an antipsychotic requires urgent cessation and medical assessment.

Dementia with Lewy bodies or Parkinson's disease dementia increases the risk of severe antipsychotic sensitivity and motor deterioration.

Unexplained fear of a particular person, bruising, restraint, poor hygiene, malnutrition or financial control raises a safeguarding concern.

Investigation priorities

01
ABC description and timelineFirst step

Record antecedents, observable behaviour, consequences, onset, fluctuation, frequency, severity and setting.

Management branches

New distressFind causes before containment

Behaviour, perception, sleep or engagement changes acutely or becomes newly distressing.

  1. Assess physiology, delirium, pain, retention, constipation, injury, medicines and immediate least-restrictive safety needs.
  2. Describe antecedents, behaviour and consequences and ask the person and supporters about communication, routine and likely meaning.
  3. Treat clinical causes and implement personalised communication, environmental and activity measures with a named review point.

Key medicines

Risperidone for licensed persistent aggression in Alzheimer's dementiaStart 0.25 mg by mouth twice daily; if required increase by 0.25 mg twice daily no more often than every other day; usual 0.5 mg twice daily, maximum 1 mg twice daily, for no longer than 6 weeks.Use only after individual benefit-harm discussion; monitor sedation, orthostatic hypotension, falls, extrapyramidal effects and cerebrovascular risk; reduce and titrate more slowly in renal or hepatic impairment, and avoid reflex use in Lewy-body or Parkinson's disease dementia.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • NICE NG97 dementia recommendationsStructured cause assessment, psychosocial care, strict antipsychotic thresholds, six-week review, stopping, activities and valproate advice.
  • NICE antipsychotic decision aidShared decision support covering possible benefit, common adverse effects and increased stroke and mortality risk.
  • Risperidone 0.5 mg SmPCCurrent UK licensed indication, dose titration, maximum, six-week limit and safety information for Alzheimer's aggression.
  • NICE CG103 delirium recommendationsRecognition and management of acute fluctuating change that may present as altered behaviour in dementia.
  • NICE NG189 safeguarding care-home adultsRecognition, immediate safety, reporting and organisational response to possible abuse and neglect in care homes.

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom