Ok.. My 2 cents worth. Personally I have felt the " sweats' sometimes when I take my 7.5 mg Percs and sometimes I don't. Sometimes I get a longer feeling of so called relief at first than I do other times. I personally think it has to do with your body's state at the time. Are you tired, is your belly full. anything on your mind etc. Narcotics can play games with your endorphins so it may be anything at all. it really is kind of hard to pin point. I do agree with the difference in generics. Once i was given actual Endocet brand name instead of generic. WHAT A DIFFERENCE. Then I received generic. Now if i have to get a generic I ask for Watsons ( the round ). Of the generics I found these work the best.