Can Mucinex (Guaifenesin) cause gastritis or irritate existing gastritis/ulcer?
I was taking Mucinex for 5 days, 400mg once a day, and now my stomach is bothering me (burning pain). I have suffered from gastritis and a gastric ulcer in the past. Could this medication cause or aggravate those problems? It was actually helping my sinuses to drain, but now I'm afraid to take it.