- Received any drug with potential anti-emetic effect within 24 hours prior to the start of study-designated chemotherapeutic agent: HT3 receptor or substance P/neurokinin 1(NK1) receptor antagonists; Dopamine receptor antagonists (metoclopramide); Phenothiazine anti-emetics (prochlorperazine, thiethylperazine and perphenazine); Diphenhydramine, scopolamine, chlorpheniramine maleate, trimethobenzamide; Haloperidol, droperidol, tetrahydrocannabinol, or nabilone