How long until sour taste goes away with GERD?

Tolya; yes you did the right thing most people that end up with the sour mouth etc it is not the right medication for them and the doctor well need to change it but if it does show up give it at least 2 weeks and see how the sour stomach or mouth feels. At least the pain is gone. That is a big one. Good luck chuck1957

Hello Tolya
I too have suffered from a sour taste in my mouth especially if I take my omeprazole on an empty stomach. Even worse if you take your omeprazole and for breakfast just grab a cup of coffee.
For best results I take my 40mg omeprazole first thing in the morning then wait approx 20 to 30 minutes before sitting down to breakfast.
Also, I have noticed the slower I eat in the morning the better chance my GERD isn't as severe.
Lastly, despite enjoying coffee at all hours of the day it's definitely one beverage for me to limit. I believe it's the acidic acid in the coffee that gives me the sour stomach/heartburn.
As for how long does it take before the sour stomach goes away I would say everybody different but for the most part you should notice some relief within 10 to 12 days.
Finally, if you continue to suffer longer than 2 weeks I would call your doctor to make an appointment to see if any diagnostic test are necessary.
Feel better
bestpup