3 groups.~Group (C) / (I):20 patient (control group) :~Patients will receive 20 ml 0.25% levobupivacaine into the interfascial plane below erector spinae muscle at level of T5.~Group (D)/ (II) :20 patient (Dexmetonidine group) :~Patient will receive 20ml 0.25% levobupivacaineas above + 1μ/kg dexmedetomidine.~Group (M) / (III) : 20 patient (magnesium slphate group) :~Patient will receive 20ml 0.25% levobupivacaineas above + 0.7 mg/kg MgSo4 . The patient, the anesthesiologist who administered the drugs, and the data collector will be blinded to the study drugs.
To compare the analgesic efficacy of dexmedetomidine and magnesium sulphate as adjuvants to levobupivacaine in erector spinae plane block in modified radical mastectomy surgery for acute and chronic pain management.