<qa>  What is the emetogenic potential of the agents being administered?Drugs used to improve the control of nausea and vomiting include serotonin antagonists, dopamine antagonist metoclopramide, prochlorperazine, corticosteroids, benzodiazepines, and phenothiazines. The American Society of Clinical Oncology ASCO has developed clinical practice guidelines for the management of chemotherapy-induced nausea and vomiting based on the emetogenic potential of the agents being administered. For combinations with moderate emetogenic potential, acute emesis is managed with a corticosteroid and serotonin receptor antagonists. Serotonin receptor antagonists currently available include ondansetron, granisetron, and dolasetron. Studies indicate they are equally effective in the management of chemotherapy-related nauseavomitingretching. Delayed emesis greater than 24 hours post-chemotherapy can be controlled with a number of agents including steroids, serotonin receptor antagonists or metoclopramide. Recommended combinations include dexamethasone, 8 mg for 2-3 days, then 4 mg for 1-2 days and metoclopramide, 20-40 mg twice daily to four times daily for 3-4 days, or Zofran 8 mg twice daily for 3 days. With combination chemotherapy, patients should receive the antiemetic regimens appropriate for the chemotherapy agent with the highest emetic risk. 