I've never been able to get that without a prescription
Both me and the wife have had Sciatica (and still do from time to time)
It's a right
I had pain in my lower back and right buttock.
I was told to do more walking and my wife was told to do less
I'm not sure there's much that can be done. Painkillers can help disguise the pain but thats all.
You need to very careful with overall painkiller dosage.
Especially Co-Codamol. (Which can cause severe constipation is many folks)
Mine went within a couple of months thank goodness