Neurokinin 1 (NK1) receptor antagonists (RAs) are a class of drug used to treat nausea and vomiting in patients receiving chemotherapy. The class includes aprepitant, casopitant, and fosaprepitant. Anxiolytics are antianxiety agents used to treat the physical and psychological symptoms of anxiety. These drugs have been evaluated for use in pediatric patients to treat nausea and vomiting.