You really have to get the LPR under control to stop the post-nasal drip. The increased production of mucus is your body's attempt to protect itself from the acid. Are you on a plan to manage the LRP?
I use sudafed and mucinex. It works well for me. Getting the symptoms of lpr under control has been impossible so I just try to control the other symptoms.
That's a good question as that is one of my worst symptoms. Thought I had tried it all but looking forward to getting some new ideas on it. Been so bad lately that I'm sore from all the sniffling and hacking up mucus.