You gave an informative post mtnview and I agree its the acetominophen. The problem with opiates is, it does /can slow down the involuntary responses, specifically breathing and heart rate. This is one of the reasons terminally ill patients near the end are given the maximum morphine - sad fact but true. I think most of the people addicted to this aren't taking it for pain. If this poster does have chronic pain because I haven't checked the 'about me' yet then perhaps a pain patch would be better.