A young man was using dihydrocodeine analgesia for ear pain having had suppurative otitis media. He attended the emergency department with restlessness and twitching movements in his arms and legs. He had fever with otherwise normal vital signs. He had no signs of cerebellar pathology. Investigations were normal. The working diagnosis was of hyperkinetic reaction to dihydrocodeine. Symptoms resolved within 48 hours of withdrawing the drug. Serotonin toxicity is a rare side effect of dihydrocodeine. There is a theoretical basis for increased side effects when taken with cannabidiol-based substances.
- drug interactions
- emergency medicine
- movement disorders (other than Parkinsons)
- neurology (drugs and medicines)
- unwanted effects / adverse reactions
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Contributors JDvO, NP and AT planned and drafted the manuscript.
Funding This study was funded by National Institute for Health (NIHR) Research Trainees Coordinating Centre (JDvO is funded by an Academic Clinical Fellowship).
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.