I was just given this med perscription today and can not pay to get it filled as it cost to much.i have polycystic kidneys.and have been on pills sence I was 17.i have had my right kidney taken out 2 years ago..also my young girl has it burbut she is only 12 so no problems yet..my pain doc keeps putting on different meds to try but I can only take soon due to sideeffects and may cause renal falure..so any advice is welcome.ty