I have given my son two antibiotics , augmentin (amoxicillin and clavulanate) 7.5mls, and after 5hrs i gave azithromycin 5mls..4yrs with severe tonsilitis how dangerous is this?

Unnecessary: Why use 2 antibiotics for tonsillitis? One of those 2 antibiotics would be enough to treat a bacterial tonsillitis such as streptococcal infection. Giving both will just increase the odds of getting severe side effects from each of them. Please stop one of them.

Not Very: I hope the one time extra antibiotic dose was accidental, in which case it shouldnt result in any severe side effects or damage. Many physicians like to recommend on antibiotic for a presumed bacterial infection at a time. Even with that milder adverse effects need to be monitored and reported to your physician when they occur for any modifications in the treatment as needed.

Two antibiotics: Should not be a problem. Often we use this combination for serious infections such as pneumonia. but he does not need both antibiotics for tonsillitis. Usually one antibiotics such as amoxyl or simple penicillin is enough

Tonsillitis: Why did your pediatrician prescribe two antibiotics? This is not typical or advised. Do not over does the child. Call your doctor and clarify this. For typical strep or staph tonsillitis, 7-10 days of Augmentin (amoxicillin and clavulanate) every 12 to 8 hrs depending on the dose is enough. I don't see any benefit to adding Zithromax. Over use of antibiotics is harmful in the short and long run.