PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: At least 6 months since prior chemotherapy Concurrent etoposide and fluorouracil allowed (days 1-5) No chemotherapy before day 0 of study Endocrine therapy: Not specified Radiotherapy: Not specified Surgery: Not specified Other: No other concurrent antiemetics No concurrent high dose benzodiazepines No concurrent psychotropic agents