was perscribed Guaifen for sinus infection by doctor who wasnt my normal doctor, didnt explain side effects and he needed to....not been sleeping, nasty after taste that leads to vomiting, very nausious......oh yah and you dont take this medication if you are a diabetic, which the doctor didn't bother to check if i was, so now i'm 10 times sicker than i was.....i wouldnt recommend anyone taking this medication