Cough and Nasal Congestion
"I took mucinex d before bed because by sinuses were congested and I could feel mucus in my lungs making it hard to breathe. Shortly after taking the medication everything loosened up, my nose ran but I could breathe. Unfortunately it&#039;s now 6am and I haven&#039;t slept a wink and have had a rapid heart rate and anxiety. I have a headache and am too jittery to sleep. I did feel slight nauseous after I took the pill and very dry mouth now."