Single-dose i.v. dexamethasone--an effective anti-emetic in cancer chemotherapy.

We conducted a randomised, single-blind, placebo-controlled crossover study to assess the efficacy of a single i.v. dose of 20 mg dexamethasone as an anti-emetic in 31 patients receiving cancer chemotherapy. Patients receiving dexamethasone experienced significantly less nausea and vomiting (P less than 0.001 and P less than 0.01, respectively), and appetite and activity were normal in a majority of the treated group. Side effects were insignificant. We conclude that single-dose dexamethasone given i.v. at a dose of 20 mg is a safe and effective anti-emetic for patients receiving cancer chemotherapy excluding cisplatin.