Hello, Dr. Rynne. I have had a bad cold and was told by CVS pharmacy to take the CVS brand of Mucinex DM. They are uncoated, but I never had trouble. I started to get a little heartburn and then last night I took one and it felt like it got stuck. Now, I have pain when I swallow or when the gas comes up. Mind you, I m still coughing periodically. Is it just a raw throat or heartburn? How can I get this feeling in the back of my throat to ease up? Thank you!