New Aggression in a Man With Intellectual Disability
Mr. T is a 34-year-old man with moderate intellectual disability (IQ 52) who lives in a group home and attends a sheltered workshop. Over three weeks he has struck two staff members, refused showers, and stopped attending the workshop. He speaks in two- to three-word phrases and cannot describe pain. He takes olanzapine 10 mg nightly and divalproex 750 mg twice daily; risperidone 0.5 mg as needed was added recently and has been given 11 times in two weeks. Staff request a standing risperidone increase. He has chronic constipation (last bowel movement four days ago), is eating less, and holds his jaw when chewing. His sister is guardian.
1. What is your differential, and what do you do first?
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New aggression in a minimally verbal adult with intellectual disability is a medical symptom until proven otherwise. My differential includes fecal impaction, dental caries or abscess (he holds his jaw when chewing), GERD or esophagitis, urinary tract infection, otitis, occult fracture, seizure, sleep apnea, medication effects such as akathisia or sedation, and mood, anxiety or trauma reminders. Staff turnover or a change in routine also matters.
First steps: vital signs, abdominal and oropharyngeal examination, palpation for fecal loading, urinalysis, CBC, CMP, and imaging if impaction or dental disease is suspected. Review the medication administration record and bowel regimen, and obtain a baseline AIMS and metabolic panel. Use an adapted pain instrument with caregiver proxy report and ask what changed in his behavior before the aggression began.
Treat the constipation and arrange a dental examination before touching the antipsychotic dose. Aggression that emerges over three weeks in a previously stable man usually has a cause other than 'his disability.'
2. How do you respond to the request for a standing risperidone increase?
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I would decline for now and explain why, respectfully and in writing.
- Eleven PRNs in two weeks is a signal that something is wrong, not a treatment plan. A standing increase would function as chemical restraint if the goal is staff convenience or containment.
- Risperidone is being used off-label for behavior; it adds EPS, sedation, weight gain, hyperprolactinemia and QT risk, and he already takes olanzapine, so he is receiving two antipsychotics without a clear target symptom or taper plan.
- Regulatory standards require documented target symptoms, rationale, consent from the guardian, monitoring, and periodic attempts at dose reduction.
- If, after medical causes are treated and a functional behavior plan is in place, agitation persists, I would discuss a time-limited trial with his sister, specifying the target behavior, a measurable goal, monitoring, and a planned review date.
I would also flag the polypharmacy to the prescribing clinician and to the group home's clinical leadership.
3. His constipation and a dental abscess are treated, and two weeks later the aggression has halved but he is still refusing showers. What next?
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Continued improvement after medical treatment confirms the medical contribution; the residual behavior now needs a behavioral and environmental formulation.
- Request a functional behavior assessment: what precedes the refusal, what staff do in response, and what he gains or avoids (sensory discomfort, modesty, a cold room, an unfamiliar aide).
- Support communication: a picture exchange system or simple choice board for showering, and a predictable routine with the same staff member.
- Rule out trauma history and ensure the showering approach respects privacy and dignity; never force hygiene.
- Consider whether an SSRI trial is warranted if anxiety or low mood persists, with monitoring for activation.
- Begin gradual reduction of the PRN risperidone and reassess the olanzapine dose, with weight, lipids, A1c, prolactin and AIMS on a scheduled basis.
- Set measurable goals with the group home and review in four weeks.