There is really not a drug that will dry up post nasal drip. I'd try getting on an antihistimine like Zyrtec and maybe a nasal steroid spray like NasacortAQ. There are bunches of different types so see your ENT to get on one that works ok for you. Post nasal drip usually happens when there is something that is keeping your sinus' from flowing the right direction. Talk to your ENT about this!