I'm suffering really bad! I've had this unbelievable cough that's about to make me lose my mind! I've got low back pain so severely I can hardly walk across the floor. It wasn't until I read other postings about the side effects of this drug that I realized the devastation of it! I stopped taking it yesterday. Could someone please tell me how long this drug stays in your system? I can hardly sleep at night for the severe coughing. I just choke on phlegm all day long! HELP!!!!