Figure 68-3 Algorithm for the prophylaxis and treatment of postoperative nausea and vomiting. DOLA, dolasetron; DROP, droperidol; OND, ondansetron; PONV, postoperative nausea and vomiting. (Redrawn from Watcha MF: The cost-effective management of postoperative nausea and vomiting. Anesthesiology 92:931, 2000.)