What helps greatly my postnasal drip is Calcium Ascorbate with citrus bioflavonoids complex. I use Ester C. I think mine is seasonal allergies related as I do not have it year round. I
take 4 pills when I feel it, the constant clearing of my throat and sore throat. Credit to Dr. Berg on YouTube for this remedy. Thank God it's a lifesaver for me. Also, my chiropractor showed me to press hard on my sinus bone area where your glasses lenses would be. That causes nasal drainage, that is instantly, but only temporary. I did so much research on this PND and the calcium ascorbate with bioflavonoids is the best thing ever. Also when I have PND, milk products and sugar make it worse!
Good luck bc PND sucks.