A double blind study has been lead on 75 patients affected by head and neck cancer treated with CDDP, to verify the alizapride's antiemetic efficacy versus placebo and metoclopramide. On 76 patients examined, 28 has been treated with CDDP 50 mg/mq + alizapride; 28 with CDDP 50 mg/mq + metoclopramide and finally 19 with CDDP 50 mg/mq + placebo. Both alizapride and metoclopramide administered have resulted effective on the control of the emesis induced with CDDP without side effects.