I have an abcess tooth, it just burst, dentist no in until morning. My son has a prescription of Cephalexin (Kefolex) 500 mg capsules, he never took. Thinking of taking them, as I am a bit "freaked" out right now, because a woman I work with son just died suddenly last tuesday from an untreated abcess that entered his blood stream and became sepsis. Gargled with salt water so far.