What can i do if i have constant nasal drip? and what can be the cause of it? also had a quadruple bypass in february 2018

One has : nothing to do with the other...Post Nasal Drip may be due to allergy or may be from sinus drainage...an EAR NOSE THROAT exam is indicated. Ask for a referral....Hope this helps! Dr Z

Topical therapy: If additional symptoms include: Sneezing, watery itchy eyes, itchy nose, clear nasal discharge: Intranasal steroid (i.e. fluticasone) and / or Intranasal antihistamine (i.e. olopatadine) or oral (i.e. loratadine If age > 50 & clear runny nose only, worsening with cold air exposure or eating: Intranasal anticholinergic (i.e. ipratropium bromide) or intranasal antihistamine (i.e. azelastine