My tongue and the inside mouth feels like raw hamburger meat, cant drink anything , its so painful I cant brush my teeth. I was given this medication because my sinus tooth needs a root canal . they gave me a different Antibiotic that cleared it up enough to take the pain away. He prescribed me the Cephalexin 500mg to take the morning of treatment but I am disabled and don't have dental coverage. My tooth started hurting again so I started taking the Cephalexin hoping it would take away the pain, now I am experiencing all the pain and swelling of my tongue . Please help me if you can with some advice. Sincerely , Roxanne Coy