Dear Dr. Tom, We have an anesthesiologist who wants to try a new drug--Naltrexone--for nausea side effects after duramorph anesthesia. I could not find it in your 1996 edition--must be a new drug--is there any advantage to this over phenergan or other antiemetics. I don't know why he wants to try this, in the first place. Do you have any information on it? Thanks Chris Lundberg Indianapolis IN