الفهرس 
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Abstract
Tonsillectomy is a commonly performed Otolaryngological operation, accounting for 20% of all operations performed by Otolaryngologists. Despite improvements in anesthetic and surgical techniques, post-tonsillectomy pain has continued to be a significant clinical concern.
In this study, 90 patients of age 3 to 20 years old of both genders were assessed to detect the role of preoperative ketamine in reducing pain following tonsillectomy. Fourty five patients received preoperative ketamine of a dose 1 mg/kg, the other 45 patients received nothing as a placebo and follow up of all patients in the outpatient clinic was done for about 10 days after the operation.
The data were statistically analyzed showed a statistically significant difference in reduction of pain sensation, edema and time to return to normal diet with no significant difference as regard postoperative nausea, vomiting, bleeding and fever between the two groups.