 [ Symptoms ] been on keflex for 4 days now for strep and am really no better is this common [ Disease ] i do not know how you were diagnosed or if the strep diagnosis was correct if it was a rapid strep test or culture then the diagnosis would be accurate and the keflex should be helpful if it was just a look and see diagnosis based solely on appearance then i would question that you have strep if you have a viral infection even mono the antibiotic would be totally ineffective