BackgroundIn England and Wales mental health services need to take account of the Mental Capacity Act 2005 and the Mental Health Act 1983. The overlap between these two causes dilemmas for clinicians.AimsTo describe the frequency and characteristics of patients who fall into two potentially anomalous groups: those who are not detained but lack mental capacity; and those who are detained but have mental capacity.MethodCross-sectional study of 200 patients admitted to psychiatric wards. We assessed mental capacity using a semi-structured interview, the MacArthur Competence Assessment Tool for Treatment (MacCAT–T).ResultsOf the in-patient sample, 24% were informal but lacked capacity: these patients felt more coerced and had greater levels of treatment refusal than informal participants with capacity. People detained under the Mental Health Act with capacity comprised a small group (6%) that was hard to characterise.ConclusionsOur data suggest that psychiatrists in England and Wales need to take account of the Mental Capacity Act, and in particular best interests judgments and deprivation of liberty safeguards, more explicitly than is perhaps currently the case.

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Schizophrenia is a serious long-term mental disorder which usually presents in adolescence or early adulthood. However, poor adherence to oral antipsychotics can lead to relapse and rehospitalisation. We report an adolescent male with schizophrenia who was referred to the South London & Maudsley National Health Service Foundation Trust, London, UK, in 2015 due to worsening psychotic symptoms. Following poor compliance with oral medications, a four-week regimen of paliperidone palmitate long-acting injections was initiated, with an initial positive response. However, 10 days after the second dose, the patient developed severe acute-onset delirium with fluctuating levels of consciousness. Paliperidone palmitate was discontinued and the patient instead underwent a course of zuclopenthixol decanoate long-acting injections with a favourable outcome.

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