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Psychopharmacology and Psychiatry Updates

Psychopharmacology Insights: Clozapine and Constipation

Sep 29, 2023
Psychopharmacology expert, Jonathan Meyer, M.D., talks about the severe side effect of clozapine: constipation. He discusses the cause of constipation due to the drug's strong anticholinergic effects and effective management strategies such as using laxatives and tapering certain medications. The podcast also highlights the importance of managing treatment-resistant illness and provides insights on secretagogues for constipation in clozapine users.
12:25

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Quick takeaways

  • Clozapine can cause severe constipation due to its anticholinergic effects, and managing constipation effectively is crucial to prevent serious medical complications.
  • To manage constipation caused by clozapine, it is important to gradually discontinue other systemically-acting anticholinergic medications, taper off non-psychiatric anticholinergic medications, temporarily stop supplemental iron, encourage reporting lack of bowel movement, maintain fluid intake and exercise regularly, and consider appropriate laxatives if needed.

Deep dives

Clozapine-induced constipation: A serious adverse effect

Clozapine can cause severe constipation due to its strong anticholinergic effects. The average colonic transit time (CTT) in adults is 24 hours, but in patients on clozapine, the median CTT increases to 110 hours. Common laxatives like docusate only reduce CTT to 62 hours. It is crucial to manage constipation effectively as it can lead to serious medical complications, including ileus which can be fatal.

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