I have been on the Sandoz - Novartis patches for for a month. I only had one that did not want to stick, put it on and put a bandage over it, by evening it was stuck on. I use a little vinegar on the spot where I am putting the patch to clean it, then dry it off and make sure I am sitting when I put them on to avoid wrinkling.
So far I have had good results with them, nipple soreness and breast buds have formed.