Patients will be treated for 2 consecutive chemo cycles with the study drug for one and placebo for the other. In addition, patients will receive an injection before the chemo, either ondansetron (if receiving placebo inhalation) or normal saline) if receiving active study drug. They will take study medication for 3 days, 4 times daily and fill out VAS scores before and after doses. Patients will be given rescue medication with each dose.