Have been using Sinus Rinse once daily for 3 days. It is very effective at preventing my chronic cough, but 3 hrs after going to bed (sleeping on 2 pillows) my cough comes on and requires that I take cough medicine. Should I do the Rinse twice a day Author: Genie Sinus Rinse will help in removing the phlegm that may be causing your cough. I suggest you try using the product twice a day for better results. Make sure you rinse at least an hour before bedtime to avoid residual solution draining down your throat. Last modified:12-07-2009, 7:07 pm Number of views:182 Ketan C. Mehta, MD Diplomate, certified by American Boards of Internal Medicine, Pulmonary Medicine and Critical Care Medicine. Disclaimer