Will mucinex (guaifenesin) dm make me sleepy. i have this horrible dry cough from a summer cold and it is hurting my chest. coughing nonstop. hard to take deep brea?

Cough: Dextromethorphan (dm) is generally non sedating and should not affect sleep

Yes: Suppressing the cough by going to sleep may be helpful. Increase fluids lots to ease cough. Pain to take a deep breath is concerning, if associated with shortness of breath or wheezing, you should see a physician. If you think you have strained a rib with the coughing, you could see a Chiropractor that offers massage services after adjustment. Most rib pain, at your age, is musculoskeletal.