Granisetron (3 mg/body) was administered immediately before single CDDP administration (80 mg/m 2 or more) to 53 patients with lung cancer. This chemotherapy was performed a total of 73 times. Concerning Grade 2 or 3 nausea and vomiting, good conditions were observed on day 1 (day of treatment), most marked aggravation on day 2, and initiation of improvement on day 4. Vomiting was slight on day 1, most aggravated on day 2, but began to improve on day 3; good results were generally observed thereafter. Decreased appetite was slight on day 1, but was most aggravated on day 3 and 4; its recovery was delayed even until day 7. In the treatment for delayed emesis, comparison was made among the group treated with granisetron alone who did not require treatment for delayed emesis, the group with delayed emesis treated with granisetron, and the group with delayed emesis with drugs other than granisetron. Slightly better results were observed in terms of nausea, vomiting, and the frequency of vomiting in the group treated with granisetron alone on days 2 and 3. However, no significant difference was observed in decreased appetite among the 3 groups. Granisetron had no side effects and was safe. It inhibited vomiting, but measures to improve decrease appetite are needed.