My doctor tapered me off opana ER 20 and 10 IR. He used some ER 15 I already had, to taper me off and I got the chills/sweats, nausea, diarrhea... but the worst is a nasty taste in my mouth. It is the worst!!! I have to have mints in my mouth all the and can only drink "strong" drinks (ie. high in syrup - Sunkist), and even that doesn't work most of the time. Actually, it has been going on for a long time, ever since the doctor has determined it isn't really helping me because I have built up a tolerance and I have been taking less. I didn't know what it was then. Now the 'taste' is interferring my eating/drinking. HELP!!!