HRS-2129 for managing pain after abdominal surgery

A Phase Ⅱ/Ⅲ Study to Evaluate the Efficacy and Safety of HRS-2129 for Postsurgical Pain Management in Abdominal Surgery

This trial will test whether HRS-2129 tablets provide better pain relief than tramadol for adults after abdominal surgery.

Quick facts

• Phase: Phase2; Phase3
• Study type: Interventional
• Enrollment: 360 (estimated)
• Ages: 18 Years and up
• Sex: All
• Sponsor: Shandong Suncadia Medicine Co., Ltd. (Industry-sponsored)
• Locations: 2 sites (Zhengzhou, Henan and 1 other locations)
• Trial ID: NCT07185594 on ClinicalTrials.gov

What this trial studies

This phase II/III, multi-center, randomized, double-blind, comparator-controlled trial enrolls adults undergoing laparotomy or laparoscopy under general anesthesia. Participants who report moderate-to-severe resting pain (NRS ≥4) within 6 hours after the last suture are randomized to receive HRS-2129 tablets, tramadol sustained-release tablets, or a blank preparation under double-blind conditions. Efficacy will be measured by postoperative pain scores and use of rescue analgesics, while safety will be tracked through adverse event reporting and clinical assessments. The study is conducted at multiple hospitals in China and follows patients through the immediate postoperative period to determine short-term analgesic benefit and tolerability.

Who should consider this trial

Good fit: Adults aged 18 or older scheduled for abdominal surgery (laparotomy or laparoscopy) with BMI 18.0–30.0 kg/m², ASA physical status I–II, and a resting pain NRS ≥4 within 6 hours after surgery are the intended participants.

Not a fit: Patients with higher surgical risk (ASA III or above), BMI outside the 18–30 range, those who do not reach the pain threshold within 6 hours after surgery, or with other exclusionary conditions may not benefit from participation.

Why it matters

Potential benefit: If successful, HRS-2129 could offer improved pain relief or fewer side effects than standard tramadol after abdominal surgery.

How similar studies have performed: Comparable trials of new postoperative analgesics have shown mixed results, and HRS-2129 appears to be a novel agent without large published phase II/III outcomes to date.

Eligibility criteria

Inclusion Criteria:

1. Voluntarily sign the informed consent form before initiating trial-related activities, fully understand the purpose and significance of this trial, and voluntarily comply with the trial procedures;
2. Scheduled to undergo abdominal surgery (laparotomy or laparoscopy) under general anesthesia;
3. Aged ≥ 18 years (based on the date of signing the informed consent form), regardless of gender;
4. Body Mass Index (BMI) between 18.0 kg/m² and 30.0 kg/m² (inclusive);
5. American Society of Anesthesiologists (ASA) Physical Status Classification Grade I to II;
6. Within 6 hours after surgery (timed from the completion of the last suture), the subject has a Resting Pain Numeric Rating Scale (NRS) score ≥ 4 at any time point;
7. Male and female subjects of childbearing potential must agree to use effective contraceptive measures together with their partners from the time of signing the informed consent form until 1 month after the last administration of the investigational product, with no childbearing plans and no intention to donate sperm/eggs; Female subjects of childbearing potential must have a negative serum pregnancy test within 3 days before the first administration (or within 2 days before surgery) and must not be breastfeeding.

Exclusion Criteria:

1. Subjects with a history of asthma, chronic urticaria, severe allergic reactions (see Appendix 13.11 for details), allergies to multiple (3 or more) drugs or foods, as well as a personal history or family history of hereditary angioedema before randomization;
2. Subjects with a history of new-onset myocardial infarction or unstable angina pectoris within 6 months before randomization, or a history of New York Heart Association (NYHA) Heart Failure Classification Grade II or higher;
3. Subjects with a history of arrhythmia requiring treatment before surgery;
4. Subjects who developed severe arrhythmia during surgery and were deemed unsuitable for participation in this study by the investigator;
5. Subjects with a history of malignant tumor within 5 years before randomization (except for cutaneous squamous cell carcinoma or cutaneous basal cell carcinoma that has been completely resected and is clinically stable);
6. Subjects with a previous history of motion sickness, and the investigator judges that they may experience nausea and vomiting after surgery;
7. Subjects with a history of mental system diseases (such as schizophrenia, depression, etc.) and cognitive impairment before randomization;
8. Subjects with concurrent pain in various parts of the body, which the investigator believes may confuse the assessment of postoperative pain Subjects with a history of pheochromocytoma before randomization;
9. Subjects with concurrent conditions that the investigator believes may affect pain assessment, such as skin or neurological lesions in the affected skin area that may affect sensation;
10. Subjects with a previous surgical history at the surgical site;
11. QTc interval at screening: \> 450 ms for males and \> 470 ms for females (QTc calculated using the Fridericia formula); other electrocardiographic abnormalities that are clinically significant as judged by the investigator, which may affect the subject's safety or cause distress to the subject's participation in this clinical trial;
12. Subjects with hypertension (systolic blood pressure \> 180 mmHg or diastolic blood pressure \> 110 mmHg) or hypotension (systolic blood pressure \< 90 mmHg or diastolic blood pressure \< 60 mmHg) at screening, excluding abnormalities occurring during the period from entry into the operating room to exit from the recovery room;
13. Subjects with laboratory test abnormalities at screening;
14. Positive hepatitis B surface antigen (HBsAg) or positive hepatitis C virus antibody (HCV Ab) at screening (further testing for hepatitis B virus deoxyribonucleic acid (HBV DNA) titer or hepatitis C virus ribonucleic acid (HCV RNA) is required; subjects with results exceeding the detection limit of the assay must be excluded); positive human immunodeficiency virus antibody (HIV Ab); positive serum treponema pallidum antibody (TP Ab) (further testing for treponema pallidum titer is required; subjects with positive results must be excluded);
15. Participation in any other clinical study within 3 months before randomization;
16. Use of other drugs that affect analgesic efficacy before screening, where the time from the last dose to randomization is less than 5 times the drug's half-life;
17. Other circumstances where the investigator judges that the subject is unsuitable for participation in this clinical trial.

Where this trial is running

Zhengzhou, Henan and 1 other locations

• The First Affiliated Hospital of Zhengzhou University — Zhengzhou, Henan, China (Recruiting)
• The Second Affiliated Hospital of Zhejiang University School of Medicine — Hangzhou, Zhejiang, China (Recruiting)

Study contacts

• Study coordinator: Lei Tang

Conditions Postoperative Analgesia