Comparing pain relief methods after surgery
Official title: Comparing Analgesic Regimen Effectiveness and Safety for Surgery (CARES) Trial
Run by University of Michigan · NCT05722002 · Data updated 2026-11-12
This study is testing whether a combination of over-the-counter pain relievers works better and has fewer side effects than low-dose opioids for people recovering from common surgeries.
Quick facts
| Phase | Phase 4 |
|---|---|
| Study type | Interventional |
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 900 (estimated) |
| Sponsor | University of Michigan Academic / other |
| Locations | 8 sites (Ann Arbor, Michigan and 7 other locations) |
| Status | Recruiting |
| Started | February 6, 2023 |
| Main results expected | February 10, 2027 |
| Study ends | August 31, 2027 |
| Registry record updated | August 28, 2026 |
| Trial ID | NCT05722002 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are adults undergoing laparoscopic gallbladder removal, inguinal hernia repair, or breast lumpectomy with no significant analgesic medication use prior to surgery.
✕Probably not a fit
Patients with contraindications to NSAIDs or opioids, or those anticipating other surgeries within six months, may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This trial compares the effectiveness and safety of two pain management regimens for patients undergoing common low-risk surgical procedures, including laparoscopic gallbladder removal, hernia repair, and breast lump removal. Participants will be randomly assigned to receive either a combination of Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) and acetaminophen or a low dose of opioids plus acetaminophen. The study aims to determine if the NSAID regimen leads to better clinical outcomes and fewer side effects compared to the opioid regimen.
Why it matters
Potential benefit: If successful, this study could provide a safer and more effective pain management option for patients after surgery.
How similar studies have gone: Other studies have shown promising results in comparing NSAIDs and opioids for postoperative pain management, indicating this approach has been tested with some success.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * No significant analgesic medication use before surgery: For this study, significant analgesic medication use before surgery as use of prescriptions for opioid or NSAID medications in the past 30 days, or over-the-counter NSAID use on greater than 7 of 30 past days, as reported by the patient. * One of three common low-risk surgical procedures: For this study, the three-common low-risk surgical procedures will include laparoscopic gallbladder removal, inguinal hernia repair, and breast lumpectomy. Exclusion Criteria: * Anticipated other surgery within 6 months or anticipated life expectancy of less than 6 months * Patients with contraindications to NSAID drugs in the NSAID arm, opioid drugs in the OPIOID arm, or acetaminophen will be excluded. There are specific contraindications that will be reviewed per protocol.
Where it's running
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University of Michigan
Ann Arbor, Michigan, United States Recruiting -
Henry Ford Health System
Detroit, Michigan, United States Recruiting -
Washington University in Saint Louis
St Louis, Missouri, United States Recruiting -
Cooper University Health Care
Camden, New Jersey, United States Recruiting -
University of North Carolina Hospitals
Chapel Hill, North Carolina, United States Recruiting -
Temple University - Temple Health
Philadelphia, Pennsylvania, United States Recruiting
Show 2 more locations
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Women's College Hospital
Toronto, Ontario, Canada Recruiting -
Unity Health Toronto
Toronto, Ontario, Canada Recruiting
Study contacts
- Principal investigator: Mark Bicket, MD, PhD — University of Michigan
- Study coordinator: Sarah Clark, BA
- Email: sarahmcl@med.umich.edu
- Phone: 734-232-0324
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.