Abstract
Ondansetron is a highly selective 5-hydroxytryptamine receptor antagonist and the most commonly used anti-emetic for the prevention of postoperative nausea and vomiting. Ondansetron has a low affinity for dopamine receptors and so extrapyramidal side effects are rare. Here, we present the case of a 14-year-old girl who developed a severe post-operative acute dystonic reaction which included oculogyric crisis. We believe that ondansetron was the most likely cause, although propofol may have been a synergistic or alternative causative agent. The patient had no significant past medical history and had previously undergone two uneventful general anaesthetics which included both ondansetron and propofol. The prolonged duration and severity of the reaction and failure to fully respond to specific treatments resulted in the need for tracheal intubation and transfer to a paediatric intensive care unit. She subsequently recovered uneventfully with no ongoing neurological sequalae. Ondansetron-induced dystonic reactions are rare and unpredictable and can occur in patients who have previously received the drug without complication. They are thought to be caused by an imbalance between inhibitory and excitatory neurotransmitters in the extrapyramidal system. Specific treatments include anticholinergics, antihistamines and benzodiazepines.