Inclusion Criteria:  Patients of either sex, aged between 18-30 years old, ASA physical status I, II undergoing tonsillectomy.  Exclusion Criteria:  Patients were excluded if they had clinically important coronary atherosclerotic heart disease, a history of stroke or transient ischemic attack, Sinus bradycardia or heart block, coagulopathy, peritonsillar abscess, any infection at the site of injection, Known allergy to the study drugs (lidocaine, dexmedetomidine).