Eye infection not cleared up after tx with tobramycin for 7days,3x/ day. does this mean it's viral not bacterial. i have no allergies.

Treatment failure: Symptoms of an illness that will respond to a particular antibiotic usually start to improve within 3-4 days if the appropriate antibiotic was prescribed, and they were taken as directed. Relapse or persistence of symptoms is generally regarded as a treatment failure or inaccuracy of the original diagnosis (i.e. viral not bacterial).