is diphenhydramine used for nausea
Diphenhydramine, Lorazepam, and Dexamethasone in Treating Nausea and Vomiting Caused By Chemotherapy. This study has been terminated. RATIONALE: Diphenhydramine, lorazepam, and dexamethasone may help lessen or prevent nausea and vomiting in patients treated with chemotherapy. It is not yet known whether diphenhydramine, lorazepam, and dexamethasone are more effective than standard therapy in treating nausea and vomiting caused by chemotherapy.