Inclusion Criteria:  ● Age: 3-8years.  Weight: 10-60 kg. Sex: both males and females. ASA physical status: I-II.  Exclusion Criteria:  • Patient's guardian refusal to participate in the study.  Patients having known hypersensitivity to dexametomidine will be excluded. Patients with cardiovascular, liver or renal disease, unsatisfactory preoperative peripheral arterial oxygen saturation, neurological or psychiatric disease and coagulation disturbances. Any perioperative cardiovascular or respiratory event occurred or difficulties in pain perception and assessment which make the study intervention clinically unacceptable. Patients on regular use of analgesic or who received analgesic 24 h before surgery