- Received any drug with potential anti-emetic efficacy within 24 hours of the start of treatment or will be scheduled to receive until Study Day 5 including 5-HT3 receptor antagonists, metoclopramide, phenothiazine anti-emetics (including prochlorperazine, thiethylperazine and perphenazine), scopolamine, diphenhydramine, chlorpheniramine maleate, trimethobenzamide, all benzodiazepines except temazepam or triazolam used once nightly for sleep, haloperidol, droperidol, tetrahydrocannabinol, or nabilone, any corticosteroid including dexamethasone, hydrocortisone, methylprednisolone, prednisone (excluding topical or inhaled preparations).