Not sure what RX potency is, but if it’s not the saline solution, give it a try. I suffered for years prior to Covid, found myself in neurologist’s office with long Covid and she recommended it. It worked so fast and so well. I was shocked. For years I was plagued with a stale smoke, burning rubber smell that came and went, but sometimes stayed for weeks.
Best of luck to you. I don’t even use it all the time. Just a couple sprays and it’s gone.