Cochrane systematic reviews show the effect of acupuncture and acupressure in postoperative antiemetic treatment. The reviews show no clear difference in the effectiveness of P6 acupoint stimulation for adults and children, or for invasive and non-invasive acupoint stimulation. Moreover, there was no reliable evidence for differences in risks of postoperative nausea or vomiting after P6 acupoint stimulation compared to antiemetic drugs.