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1 results

  • Histamine in psychiatry: promethazine as a sedative anticholinergic

  • John Cookson
  • Journal:
    BJPsych Advances / Volume 25 / Issue 4 / July 2019
    Published online by Cambridge University Press:
    17 April 2019, pp. 265-268
    Print publication:
    July 2019
    • Article
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  • The author reflects on discoveries over the course of a century concerning histamine as a potent chemical signal and neurotransmitter, the development of antihistamines, including promethazine, and chlorpromazine from a common precursor, and the recognition of a major brain pathway involving histamine. Although chlorpromazine has been succeeded by numerous other antipsychotics, promethazine remains the antihistamine recommended for sedation in acutely disturbed patients, largely because it is potently anticholinergic at atropinic muscarinic receptors and therefore anti-Parkinsonian: this means it is also useful in combination with older antipsychotics such as haloperidol.

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    None.