I have been on Fentanyl (from Watson) 100mcg/h for a couple years. I didn't know that there was a difference in the medication depending on which you use. Are you saying Sandoz is stronger? And if so, how can you change from one to another? Through pharmacy or through doctor? I just started looking trying to find if any manufacturers help with price. I'm in the donut hole and am paying $263.00 a month and can't afford to continue and my doctor was no help. Any suggestions, anyone?