Below Are The Method On How To Stop Post Nasal Drip;

Take a medication such as guaifenesin
Load up on vitamin c
Use saline nasal sprays or irrigation, like a neti pot, to flush mucus, bacteria, allergens, and other irritating things out of the sinuses.
Try something menthol
Turn on a vaporizer or humidifier to increase the moisture in the air.
Sip some tea