The Aim: This prospective, randomised controlled study aimed to investigate the efficacy and respiratory effects of postoperative pain management with erector spinae plane block (ESPB) in patients undergoing percutaneous nephrolithotomy surgery. Methods: A total of 60 ASA I-II patients aged 18–65 years, scheduled to undergo percutaneous nephrolithotomy (PCNL) were included. Patients were randomized either to the ESPB or control group. Ultrasound-guided ESPB with 15mL 0.5% bupivacaine at the T11 level was performed preoperatively using the in-plane technique in the ESP group. In both groups, 1gr of intravenous paracetamol was administered intraoperatively. Postoperative pain and agitation was evaluated using VAS, Dynamic VAS at 0, 6 and 24 hours and the Riker sedation-agitation scale at 0th Hours after surgery. Peak expiratory flow rate(PEFR) and SPO2 were measured in preoperative examination and at the 0th, 6th, 24th hours postoperatively. In the postoperative period, intravenous tramadol (100mg) was administered as a rescue analgesic when VAS ≥ 4. Time and number of the rescue analgesias, mobilization time and length of hospital stay were also recorded and analyzed. Results: A significantly lower VAS and DVAS were observed at 0th, 6th, 24th hours in the ESPB group (p < 0.05 for each timepoint). Also number of and time to rescue analgesia decreased in the ESPB group (p< 0.05 and 0.01 respectively). Postoperative/preoperative PEFR ratio was lower and there were more agitated patients in control group (p<0.05). Conclusion: ESPB may have additional clinical advantages while providing effective analgesia in patients who underwent PCNL comparing to intravenous analgesia.