A systematic review 1 including 19 studies with a total of 1 548 children was abstracted in DARE. Ondansetron was associated with a significantly lower risk of post-operative vomiting than droperidol or metoclopramide. The drug dose, study quality and type of outcome were not associated with effect. It was unlikely that the results were influenced by publication bias.
Ondansetron versus droperidol (8 RCTs with 563 children): the pooled RR of post-operative vomiting using a random-effects model was 0.67 (95% CI: 0.49 to 0.90).
Ondansetron versus metoclopramide (13 RCTs with 985 children): the pooled RR of post-operative vomiting using a random-effects model was 0.56 (95% CI: 0.44 to 0.71).
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