60 female patients scheduled for breast cancer surgeries, allocated in 3 groups for erector spinae block with bupivacaine and erector spinae block with dexmedetomidine added to bupivacaine and control group. During anesthesia: total intraoperative fentanyl required will be recorded. After surgery the first time of request for analgesic will be recorded. after request of analgesia all patients will be connected to PCA device containing morphine solution, the amount of morphine consumed during the first 24 hours will be recorded. Other secondary outcomes are numerical rating scales and incidence of opioid side effects.
