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Three studies were included in the review as set by the inclusion criteria, described in table 1 . All studies included were randomised control trials (RCTs). Whilst two RCTs compared penicillin alone to penicillin plus metronidazole, the third looked at penicillin in comparison with a broader spectrum penicllin (ampicillin) combined with a beta-lactamase inhibitor (Sulbactam). All studies assessed the clinical outcomes of these treatments on peritonsillar abscess, including recurrence rate, symptom improvement and the duration of pyrexia. The outcomes will be grouped and assessed across the evidence. Table 2 shows the full findings of each study.