Acute Dystonic Reactions in Children Treated for Headache With Prochlorperazine or Metoclopramide

Area of Science:

• Pediatric pharmacology
• Neurology
• Clinical toxicology

Background:

• Incidences of dystonic reactions to metoclopramide and prochlorperazine in children are not well-characterized.
• Acute dystonic reactions are potential adverse events associated with dopamine receptor-blocking agents.

Purpose of the Study:

• To characterize and compare the incidence of dystonic reactions in pediatric patients treated with metoclopramide versus prochlorperazine for headache.
• To determine the relative risk of dystonic reactions associated with each medication.

Main Methods:

• Retrospective review of medical records from a tertiary care pediatric hospital.
• Analysis of 4588 clinical encounters involving metoclopramide or prochlorperazine for headache treatment.
• Logistic regression to identify factors associated with acute dystonic reactions.

Main Results:

• One dystonic reaction occurred with metoclopramide (0.049%) versus eleven with prochlorperazine (0.43%).
• Prochlorperazine use was associated with a significantly higher relative risk (8.85) of dystonic reactions compared to metoclopramide.
• Increased number of doses and prochlorperazine administration were significant predictors of dystonic reactions.

Conclusions:

• Dystonic reactions are rare but more frequent with prochlorperazine than metoclopramide in pediatric headache treatment.
• The findings highlight a differential risk profile for these medications in pediatric patients.
• Clinical vigilance is warranted when prescribing these agents for headache in children.