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Letters Cannabinoid hyperemesis syndrome

Cyclic vomiting syndrome: an important differential diagnosis of cannabinoid hyperemesis syndrome

BMJ 2019; 366 doi: (Published 23 September 2019) Cite this as: BMJ 2019;366:l5615
  1. Tobias R Spiller, resident1,
  2. Katarina Künzler, senior physician2,
  3. Basil Caduff, head2
  1. 1Department of Consultation-Liaison Psychiatry and Psychosomatic Medicine, University Hospital Zurich, Rämistrasse 100, 8091 Zurich, Switzerland
  2. 2Department of Internal Medicine, Limmattal Hospital, Urdorferstrasse 100, 8952 Schlieren, Switzerland
  1. tobiasraphael.spiller{at}

Chocron and colleagues discuss cannabinoid hyperemesis syndrome.1 We would like to emphasise the importance of cyclic vomiting syndrome (CVS) as a differential diagnosis, especially in patients presenting to emergency departments. Such patients require different pharmacological treatment from those with cannabinoid hyperemesis syndrome.

Most patients with CVS present at emergency departments with episodes of vomiting, …

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