The postoperative incidence of catheter-related bladder discomfort (CRBD) ranges from 47% to 95%. It increases postoperative pain and agitation, thus requiring early intervention. Although a variety of drugs are used for the prevention or treatment of CRBD, the adverse reactions of most of these drugs have limited their clinical application. In long-term clinical practice, we found that indomethacin suppository has a good therapeutic effect on the discomfort of pelvic-related organs caused by nociceptive stimulation. However, its preventive effect on CRBD has not been reported yet. We hypothesized that indomethacin suppository has a preventive effect on postoperative CRBD. To verify this hypothesis, patients undergoing laparoscopic radical prostatectomy were enrolled in the study. Patients in the intervention group received 50 mg of indomethacin suppository via the rectal route immediately after surgery, while those in the control group received no treatment. The severity of CRBD, pain scores, consumption of analgesics, other perioperative adverse reactions, and patient satisfaction were observed and recorded at 0, 1, 2, and 6 hours after surgery.