Inclusion Criteria:-  ASA classification I-ll, Aged >18 years, weight 50-85 kg, Patients who will undergo abdominal cancer surgery.  Exclusion Criteria:-  Patient's refusal, patients with a history of allergies to studied drugs, Patients with coagulation disorders, Patients with opioid dependence, Patients with morbid obesity (body mass index more than 40 kg/m2), Patients with sepsis, patients with psychiatric illnesses that will interfere with the perception and assessment of pain .