• F Cox.
• Br J Theatre Nurs. 1999 Dec 1;9(12):556-63, 566.

ObjectivesTo determine the efficacy and safety of ondansetron for the prevention and treatment of postoperative nausea and vomiting (PONV) in adults.DesignSystematic review of published double-blind randomised controlled trials.Data SourcesTwenty seven trials from 1990 to July 1998 retrieved from a systematic literature search (Medline, Cinahl, Embase, Cochrane Library, reference lists, hand searching of anaesthetic journals, & provided manufacturer information); restricted to English language.Main Outcome MeasuresEstimation of efficacy (incidence of complete absence of nausea or other outcome measure as defined by the authors) at 24 hours.ResultsSeven double-blind randomised controlled trials with 1,623 patients studied intravenous ondansetron 1 mg, 4 mg, or 8 mg for the treatment of postoperative nausea and vomiting (PONV). Four mg, compared with metoclopramide 10 mg, produced higher patient satisfaction scores and an increased incidence of freedom from nausea at 24 hours. Further studies are required to compare the safety, efficacy and dose response with other anti-emetics at 24 hours. Twenty double-blind randomised controlled trials with 4,364 patients studied intravenous and oral administration of ondansetron 1 mg, 4 mg, and 8 mg for the prevention of postoperative nausea and vomiting. There appears to be no significant difference between droperidol (0.625 mg, 1 mg or 1.25 mg) i.v. and ondansetron 4 mg in efficacy and incidence of side effects. Compared with metoclopramide, ondansetron produced less nausea but the incidence of vomiting was the same at 24 hours.ConclusionsFurther PONV could be prevented with ondansetron 4 mg compared with placebo and metoclopramide 10 mg. Further studies are required to compare ondansetron with other anti-emetics for the treatment of PONV. For prophylaxis of PONV ondansetron 4 mg appears to be equal to low dose droperidol in efficacy and the incidence of side effects, and superior to metoclopramide. Ondansetron should perhaps be limited to second line treatment in view of patient satisfaction, efficacy and cost when compared with droperidol.

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