morbidity after tonsillictomy remains asignificant problem therefore they recommend prophylactic antibiotics to reduce it.in the other hand, the overuse of antimicrobial agents can lead to antimicrobial resistance ,adverse drug events,and unnecessary cost.so,the effectiveness and necessity of antibiotic following tonsillictomy needs to be studied .

Inclusion Criteria:

200 patients who are scheduled for tonsillectomy with or without adenoidectomy, and their age are less than 18 years old of either gender will be included in our study

Exclusion Criteria:

• 1-Patients age ≥ 18 years.

  2-Trials in which antibiotics was administrated locally or used in the immediate preoperative period (within seven days before surgery).

  3. Medical comorbidity requiring treatment with antibiotics e.g. Rheumatic heart disease

  4-Patients undergoing the following procedures:

  1. Unilateral tonsillectomy or biopsy.
  2. Tonsillectomy for known carcinoma.
  3. Tonsillectomy in conjunction with palatal surgery.
  4. Hot tonsillectomy for tonsillar abscess