My daughter is 13 and weighs about 125 lbs, she has a severe middle ear infection along with an upper respiratory infection. We went to the ER and they gave her some antibiotic ear drops but that was all. That was 4 days ago. She is not feeling any better and hurts tremendously. I have some antibiotics here and was wondering which was better and safer to give her (if either). I have 500mg Cephalexin: 1 every 6 hours or 500mg Amoxicillin: 1 capsule 3 times a day. Any information would be greatly appreciated.