keflex side effects fatigue cephalexin doses keflex allergy cephalexin brand name cephalexin dosage for dogs keflex for ear infection cephalexin penicillin keflex allergic reaction keflex generic keflex generic name http://cephalexin-medicine.accountant keflex skin infection cephalexin and penicillin allergy allergy to keflex keflex for tooth infection cephalexin for tooth infection