I get perennial rhinitis, so if that is what he has, then buy some Pirinase nasal spray, don't let them fob him off with Boots brand, it isn't as good. The sniffy counter assistant said 'but it has the same ingredients'. However, I think they must have upped the aqua a little too much. I hate the constant drip down the back of my throat. It's awful. It takes a couple of days of a spray or two in each nostril both morning and night to start with, but after that he can go down to just at night. He can also get it on prescription, but he may like to try it out first. My greatest fear is that they will stop making it - I almost had a heart attack when I couldn't see it for sale. It used to be Flixonase, the Piriton lot bought them out. If I run out, as I do occasionally, I am back to the constant coughing, sneezing and build-up in my sinuses after a couple of days.