Inclusion Criteria:  Physical status American Society of Anesthesiologist (ASA) I or II Electively scheduled for laparoscopic hysterectomy,  Exclusion Criteria:  Patients who refuse to participate Body mass index (BMI) > 30 ASA physical status > II Diabetes Major illnesses (e.g., cardiac, respiratory, renal, hepatic or neurological) Coagulation abnormalities Pregnancy Known hypersensitivity to aripiprazole or contraindications to its use (a psychiatric illness, patients on antidepressants, dementia-related psychosis) History of drug addiction or alcohol abuse Mental retardation interfering with the evaluation of pain scores or PCA programs .