Hello all, I m asking for help regarding switching through no fault of my own from apotex brand 50 mgs patches to alvogen 50 patches. Both are matrix but I seem to be using up the alvogen brand faster than the apotex brand. Right now I am in early withdrawal with upset tummy, pain at 6-7 , shakiness, emotional, headache, etc. I finally broke down and put on a new patch about 12 hours early. .only cause I couldn't stand it anymore. I do have tramadol 50 MG for breakthrough pain but allowed 3 a day. If I did one now I would not sleep tonight. I should add I use a heating pad on low on the patch but that did not ever cause the apotex brand to run out early. I'm curious if anyone else has had issues with switching brands. I just put on my 6 patch and looking back on my calendar it's the 3rd time I've had to do this...but today is my far worse early withdrawal. Again any input would be welcome. . I don't know how important it is but I'm 64. Been on fentynal 10+years. Was originally on oxycontin but got put on patches. First 75 but cut to 50's and tramadol as doctor worried that after hip surgery I would need massive amounts of meds to control pain..still no hip surgery but that's another story about needing dental work......look forward to comments ..many thanks.