Using them for years. They work well for muscle spasms in the back caused by root nerve involvement. They were not covered by many insurance policies, docs were telling pts tp rub in lidocaine cream. Too much can cause problems, as using more than 2 patches can cause slurring of speech and siezures. I love them.:D

Yes, I do agree... on the nerve roots where the pain is being generated for many PNers with nerve root pathology, they are great.
I used them on my back many times, and even for my groin/hip injury years ago.

The stick-um adhesive leaves something to be desired, but extra tape helps. Sweating does NOT help. If a person has a previous diagnosis of shingles, most of the insurances will cover them. But many elderly with limited policies without shingles codes will not have them covered I have seen. Lucky for me I have a shingles history.
But in long term care, nursing homes, they are replacing opiates for many patients.

Placement continues to be a problem IMO...and the adhesive. But fixing those weaknesses, can give alot of relief IMO.

I have placed 1/2 patch behind my knee at times, to hit that nerve that goes thru there...and it has really helped with severe foot pain (which for me is rare, but does happen now and then).