Nerve Blocks vs. Opioids: Why Regional Anesthesia Is Changing the Way We Treat Pain
Nerve Blocks vs Opioids: Why Regional Anesthesia Is Changing the Way We Treat Pain
For a long time, opioids were seen as the “default” answer to pain.
The reason for this is simple: when it comes to reducing pain, opioids tend to work. The challenge, however, is everything that frequently comes with them — specifically, nausea, sedation, and, in some cases, physical dependence. 1 Over time, this has resulted in both clinicians and patients asking a simple but important question: is there a way to manage pain just as effectively, without relying so heavily on opioids?
More and more, the answer seems to be pointing in the same direction: nerve blocks.
A nerve block is exactly what it sounds like: a local anesthetic is injected near a specific nerve (or group of nerves), temporarily stopping pain signals from traveling to the brain. Representing a more “targeted” approach, nerve blocks tend to focus on the exact area where pain originates (versus opioids, which more affect the body as a whole). 2
With a growing body of clinical research all increasingly pointing to their advantages, nerve blocks are quickly providing a new – and exciting – method of treating pain across various clinical settings.
Strong Clinical Data Demonstrating Less Dependence on Opioids
There is significant clinical evidence that indicates that the use of nerve blocks can lead to decreased opioid use.
One such study—a systematic review conducted by the Agency for Healthcare Research and Quality (AHRQ, 2025)—examined the use of peripheral nerve blocks across a range of surgical settings, specifically relating to cardiothoracic surgery. Researchers found that nerve blocks were associated with reduced postoperative opioid consumption, while providing comparable short-term pain relief to other approaches. 3
It’s a trend that’s been observed across other studies as well. A 2024 paper on early femoral nerve blocks in patients undergoing hip fracture surgery concluded that nerve blocks that were administered early actually led to major reductions in the amount of opioids that were needed to be given to patients pre-surgery. 4
Importantly, this opioid-sparing effect is not limited to the perioperative setting. Studies conducted in emergency care environments have shown that ultrasound-guided, ED-administered nerve blocks can meaningfully reduce opioid exposure from the very start of treatment. For example, a randomized controlled trial by Benjamin Beaudoin et al., published in Academic Emergency Medicine, found that patients with acute hip fractures who received ultrasound-guided femoral nerve blocks in the emergency department experienced significantly lower pain scores and required less rescue opioid analgesia compared to those treated with systemic opioids alone—without an increase in adverse events.5 Similarly, research by Stephen Morrison et al. demonstrated that early nerve block administration, often initiated in the ED, was associated with improved pain, reduced overall opioid requirements and lower opioid-related side effects . 6 Taken together, these findings highlight how ultrasound guidance and early ED intervention have the potential to play a critical role in reducing reliance on opioids across the full continuum of care.
In Some Cases, Pain Relief is Actually Improved
A study by Morrison et al. (2016) examined the findings of a randomized controlled clinical trial that zeroed in on patients with hip fractures. In the study, patients who had experienced regional nerve blocks were shown to experience better pain relief and improved functional outcomes in comparison more standard treatments. 6
Other studies that examined emergency and trauma care found similar results. One such study – published by Beaudoin et al. (2013) – compared ultrasound-guided femoral nerve blocks with parenteral opioids in patients that had suffered acute hip fractures. The researchers found that patients who had received nerve blocks had much lower pain scores in comparison to those who had received opioids. 5
Additionally, a 2025 systematic review of emergency department applications found that ultrasound-guided nerve blocks provided more rapid and sustained pain relief than standard treatments, while also improving patient satisfaction and reducing reliance on systemic analgesics.7 In real-world ED practice, retrospective data have shown clinically meaningful reductions in pain scores—from an average of 7.4 to 2.8—following ultrasound-guided nerve block administration. 8 Taken together, these findings highlight how early, ultrasound-guided intervention in the ED can deliver faster, more consistent pain relief while improving the overall patient experience.
The reason for this? Nerve blocks don’t “mellow” pain, but rather, actively interrupt it. And that interruption – especially in the hours and days following a procedure – can mean a world of difference when it comes to pain relief.
Reduced Adverse Effects — and a More Positive Experience
Opioid usage is often accompanied by various adverse effects, including nausea, vomiting, sedation, and constipation. All of these can interfere with a patient’s recovery, and it’s why the usage of nerve blocks – which tend to reduce the necessity for opioids – can have an even greater appeal. 1
In a 2022 study by Hung et al., researchers found that patients who had received peripheral nerve blocks experienced reduced usage of opioids and less occurrence of nausea and vomiting post-procedure – all without any kind of reduction in pain relief. 9
Summary
It’s likely that opioids will almost always play some role in pain management. However, an increasingly large amount of clinical research points to the efficacy of nerve blocks and their ability to reduce usage of opioids, all while providing pain relief that’s either superior or comparable, reducing side effects, and allowing for recovery that’s faster and more functional.
References:
#1: Benyamin R, Trescot AM, Datta S, et al. Opioid complications and side effects. Pain physician. 2008;11(2 Suppl):S105-20.
#2: Chang A, Dua A. Peripheral Nerve Blocks. [Updated 2025 May 4]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK459210/?utm_source=chatgpt.com
#3: Peripheral Nerve Blocks for Postoperative Pain Management in Cardiothoracic Surgery : Systematic Review. Agency for Healthcare Research and Quality (US); 2025. Accessed August 27, 2026. https://www.ncbi.nlm.nih.gov/books/NBK619152
#4: Gerlier C, Mijahed R, Fels A, et al. Effect of early ultrasound-guided femoral nerve block on preoperative opioid consumption in emergency patients with hip fracture: a randomized trial. European journal of emergency medicine : official journal of the European Society for Emergency Medicine. 2024;31(1):18-28. doi:10.1097/MEJ.0000000000001075
#5: Beaudoin FL, Haran JP, Liebmann O. A comparison of ultrasound-guided three-in-one femoral nerve block versus parenteral opioids alone for analgesia in emergency department patients with hip fractures: a randomized controlled trial. Academic emergency medicine : official journal of the Society for Academic Emergency Medicine. 2013;20(6):584-591.
#6: Morrison RS, Dickman E, Hwang U, et al. Regional Nerve Blocks Improve Pain and Functional Outcomes in Hip Fracture: A Randomized Controlled Trial. Journal of the American Geriatrics Society. 2016;64(12):2433-2439. doi:10.1111/jgs.14386
#7: Abu Halimah J, Zalah AA, Alammari AH, et al. Regional Nerve Blocks for Trauma Pain in the Emergency Department: A Systematic Review of Efficacy and Safety. Cureus. 2025;17(4):e82073. doi:10.7759/cureus.82073
#8: Merz-Herrala J, Leu N, Anderson E, et al. Safety and Pain Reduction in Emergency Practitioner Ultrasound-Guided Nerve Blocks: A One-Year Retrospective Study. Annals of emergency medicine. 2024;83(1):14-21. doi:10.1016/j.annemergmed.2023.08.482
#9: Hung K-C, Ko C-C, Hsu C-W, Pang Y-L, Chen J-Y, Sun C-K. Association of peripheral nerve blocks with patient-reported quality of recovery in female patients receiving breast cancer surgery: a systematic review and meta-analysis of randomized controlled studies. Canadian journal of anaesthesia = Journal canadien d’anesthesie. 2022;69(10):1288-1299.
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