I'd try that will dry you up a little. I've been using the generic of Zyrtec. It's not too bad.

If you get congestion in your chest, try Mucinex, with an expectorant. Normally that's what your post nasal drip can lead to, the chest congestion.

My mom's one friend swears by the Neti Pot, where you use the saline to irrigate the sinuses. I've found other types of applications other than the pot to do the irrigation. One was basically a squeeze bottle, and it works like a charm. Comes with premeasured salt packets for the saline solution. There are also great aerosol type can with saline in them. I use the Simply Saline brand. It's got a great nozzle on it.
Simply Saline