cough and nasal congestion
"I had sinus congestion and consequently serious pain under my eyes in the sinus area accompanied by confusion and inability to think clearly. After one Mucinex D tablet, the pain was gone. I suffered from mild insomnia that night, but I'd rather have the insomnia than the pain. I also had less ear pressure/pain during descent in an airplane after taking this drug. Another benefit for me. Thanks Mucinex."