The consequences of inadequately controlled chemotherapy-related nausea and vomiting range from minor discomfort to dose-limiting toxicity. Physical complications may occur secondary to protracted nausea and emesis. Furthermore, patient discomfort may be reflected in altered quality of life or noncompliance with therapy. As a primary caregiver, the nurse takes an active role in collaborating with the physician to prevent and/or minimize these side effects and their sequelae. An understanding of the patterns, mechanisms, and risk of chemotherapy-related nausea and vomiting is crucial to providing optimal patient care. Concepts of drug therapy are emphasized as the cornerstone of antiemetic management.