After institutional Ethics Committee approval and parents written consent, 70 children aged 3-9 years, American Society of Anesthesiologists 1-2 status, scheduled for adenotonsillectomy were enrolled in this randomized, prospective, triple-blind clinical study. Children with systemic disease, metabolic and endocrin disorders, growth developmental and motor-mental retardation, those who had a history of allergy to any of the study drugs, peritonsillar abscess, hypertension, psychiatric and epileptic disorders, chronic pain syndrome, and those who received analgesics within 24 h prior to surgery were excluded from study.