Although guidelines help physicians deliver high quality clinical care, they will have minimal impact unless familiarity and adherence are achieved. Although nausea and vomiting are highly feared toxicities of chemotherapy that markedly decrease patient quality of life, modifications in physician behavior and improvements in standards of care, particularly in terms of preventing delayed emesis, have been slow. Variations in format, goals, physician education, and institutional education may all affect guideline implementation and state-of-the-art care. The relationship between these factors and the scientific basis of antiemetic guidelines must be considered to achieve optimal results and compliance.