You want the tegaderm to be a little bigger than the patch your going to cover. I don't know what size you need, as the patches are all different sizes. you can cut the tegaderm to fit, as long as it's oversize. Just make sure to purchase tegaderm that's bigger than your patch. Ask the pharmacist if you are still unsure.
I ordered Tegaderm patches from Amazon.com and they were here in 2 days. I am on the lowest dose of Fentanyl patch, so I can cut them in half to cover the patch. They work very well if you cover your patch on a smooth area of skin. Good luck!
Thanks I found Nexcare Patches at Rite Aid they are really big so they were perfect I can cut them into 3 pieces my patches are really small. However I am going back to the Doc tomorrow to get a higher dose so not sure if that means the patches will be bigger but I am sure the Nexcare patches will fit that to like I said they are very big. :)