Cisplatin is one of the most emetogenic drugs used in clinical practice and it could result in poor compliance with chemotherapy. The 5-HT3 receptor antagonists prevent vomiting in acute phase emesis after chemotherapy in 73 - 92% of cisplatin-treated patients when coadministered with steroids, but they appear to lack efficacy in the delayed phase emesis. Ramosetron, a new 5-HT3 receptor antagonists, has been shown to have equivalent efficacy and tolerability and a longer duration of effect than granisetron in preventing acute vomiting in patients undergoing cisplatin-containing chemotherapy. Acute phase emesis was prevented in 84.8% of patients receiving ramosetron plus dexamethasone, but the CR rate of total phase emesis was less than 60%.