Hi, Doc, about the blood comes to my mouth every morning, and I can feel hard to breath sometimes only when I in bed, no blood in urine no stomach pain, it is happen when I take the cefalexin 500 mg four times a day, because of my tooth ache, after that when I woke up in the morning it was to much blood on my pillow and my shirt comes from my mouth, thanks I need your advice for stop this and result thanks,..