Although I have rsd, I use the patches, I get about three (cut) out of a whole one.
I use them on my neck, and low back, the places where I have disc problems.
I've never used a whole patch,
Just because I find them effective for what I need, and my medications work very well, but not for that disc pain. (Sorry for that ill constructed sentences today, cluster HA.)

I also cut them for use on my forearms, around my wrists and across the top of my hands. (occasional) If I hafto type a lot, or if I'm playing my guitar a lot...
Often, just putting them on my forearm (cut them longways) down the top of my hand, takes the pain out of my hands. (TOS).

pete