Background: Effective pain control after surgery is an important part of taking care of someone who has had surgery. A paravertebral block (PVB) is becoming more popular for breast surgery and is thought to be the best method for anaesthesia and pain relief after surgery. Several local and regional anaesthetic techniques were looked at to see if they could reduce post-surgery pain after breast surgery. The thoracic PVB technique looks promising because it reduces post-surgery pain, reduces opioid use, reduces side effects like drowsiness and the risk of breathing problems, and saves money. The goal of this study was to find out how well dexmedetomidine works with ropivacaine as a paravertebral block in breast cancer surgery