Avoiding emetogenic triggers in the first place is more effective than using antiemetics.
Friedberg
Barry L
BL
D000765:Anesthesia, Conduction; D000779:Anesthetics, Local / Q000627:therapeutic use*; D000932:Antiemetics / Q000627:therapeutic use*; D006801:Humans; D020250:Postoperative Nausea and Vomiting / Q000209:etiology / Q000517:prevention & control*; D012307:Risk Factors
D000779:Anesthetics, Local; D000932:Antiemetics