My neuro gave me a script for Sprix when I was in a flare. It was really expensive, and burns like fire in the nose.

I used one bottle - meaning one days worth. I didn't see a change, so didn't try more.
Then, a few months later, I was having another rough spot. I happened to think of it, and this time, used 2 days worth - and did get relief. Regular pain meds don't do much for me, so I rarely take them. I was glad to have something to get relief.
Is it worth the cost? not so sure.
I over did it yesterday. I was just thinking about getting the Sprix out of the fridge and giving it a try, when I came here and saw your question.