Lidocaine patches available on Camino Frances, in local pharmacies?

I am wondering. I am planning on walking both the Camino LePuy and the Camino Frances one after another. I have arthritis in my mid and upper back. I get pain despite excellent fitting and light backpacks. Cannot take ibuprofen. What works for me when I hike, is before hiking or going into a situation where I know I will get pain in back is applying the over the counter lidocaine patches, two one to upper and one to lower back. If I wait until pain begins they do no good. So, my question is: Has anyone noted on their travels if the lidocaine patches are available in the French and Spanish pharmacies along the Way? I am not planning on taking anything other than minimal needed supplies in my backpack, and these patches are heavy. I can imagine having to carry a few days at a time, but not over two months worth. I have checked on google, but unable to figure out if they are available along The Way or not. Thanks ahead of time for any answers. I amm talking about over the counter versions.