Balancing analgesic efficacy with adverse effects,

The gap

Evidence profile

Sourced from the stated research gap and stated challenges and limitations and future work and recommendations and limitations section of the source papers, classified as general, spanning 6 journals. Those papers have been cited 9 times in total.

Supporting evidence — 7 representative gaps

• Optimizing Opioid Use in Pain Management: A Comprehensive Review of Clinical Benefits, Risks, and Dependence (2026) · Healthcare · cited 4× · doi

  The use of opioids in chronic non-cancer pain is controversial due to limited long-term efficacy data and safety concerns. There is a need for individualized prescribing and non-pharmacological interventions to minimize opioid exposure and improve functional outcomes. The paper identifies unequal access, prescribing variability, and persistent disparities as complicating factors in global opioid management strategies.

  generalstated research gap
  Keywords: use opioids chronic non-cancer pain controversial due limited
• Optimizing Opioid Use in Pain Management: A Comprehensive Review of Clinical Benefits, Risks, and Dependence (2026) · Healthcare · cited 4× · doi

  Balancing analgesic efficacy with adverse effects, such as tolerance and respiratory depression, is a significant challenge in opioid use. The risk of addiction and dependence is a complicating factor in opioid use, particularly in patients with psychological comorbidity or prior substance use. Unequal access, prescribing variability, and persistent disparities further complicate global opioid management strategies.

  generalstated challenges
  Keywords: balancing analgesic efficacy adverse effects tolerance respiratory depression
• Change in opioid use following spinal cord stimulation: a systematic review and meta-analysis (2026) · Regional Anesthesia & Pain Medicine · cited 1× · doi

  To our knowledge, this is the most comprehensive meta- analysis evaluating opioid use outcomes following SCS implantation among patients with chronic pain. Additionally, our study is compliant with methodological guidelines including PRISMA,28 MOOSE,41 and guidelines specifically designed for conducting systematic reviews and meta- analyses in pain medicine.60 61 Several limitations should be considered when interpreting the results of this study. First, the predominance of observational studies and the substantial heterogeneity of studies lower the certainty of evidence and warrant great caution when inter- preting the results of this study. Second, some analyses were limited to only two to four studies and there were small sample sizes for some of the subgroup analyses (ie, stimulation wave- forms) which yielded wide CIs and limited interpretability. Third, the inability to quantify possible placebo effects or psychological dependence on opioids likely influences outcomes. Fourth, as noted above, some physicians and countries require intentional opioid tapering prior to SCS implantation. While there is not strong evidence to suggest this strongly influenced our results one way or another, it is possible that opioid use could be overes- timated or underestimated depending on the intentional opioid tapering circumstances. Lastly, there likely exist significant vari- ances in opioid tapering protocols and practices following SCS implantation that were not adjusted for in our analyses.

  generallimitationsevidence 5/5
  Keywords: opioid analyses implantation there tapering meta outcomes following pain guidelines evidence limited possible likely intentional
• The impact of opioids on cognitive abilities – balancing pain management and cognitive preservation: A narrative review (2026) · Annales Academiae Medicae Silesiensis · doi

  neurotoxicity, opioid-induced to particularly in the context of chronic use [26,27]. The discussion of neuroinflammation also leads to the complex topic of opioid-induced hyperalgesia (OIH). This is a paradoxical state where opioids, meant to relieve pain, actually begin to increase a patient’s pain sensitivity. Although OIH is a recognized phenomenon, there is still considerable debate about its true prevalence and importance in cancer-related pain. This presents a major diagnostic challenge for clinicians. When a patient’s pain worsens, is it because the disease is progressing, has the patient developed tolerance, or is it OIH? Making the right call is critical because the treatment for OIH is counterintuitive: it often requires reducing the opioid dosage, not increasing it. A critical element of the acknowledgment that the observed clinical picture in patients is the result of an interaction between two powerful factors: the pain itself and the action of opioids. As shown by current meta-analyses and cohort studies, chronic pain per se is an independent risk factor for cognitive decline. The magnitude of this phenomenon is striking: it not only leads to a measurable, 9% faster decline in memory performance, but it may also slightly elevate the long- -term risk of developing dementia. This may reflect the structural brain changes visible in neuroimaging studies, which document atrophy in areas responsible for attention, executive control, and memory encoding – particularly the medial prefrontal cortex and cingulate gyrus – consistent with the concept of cognitive resource competition. Understanding this fact is essential for the differential diagnosis of cognitive deficits, allowing clinicians to distinguish symptoms stemming from the underlying disease, which themselves can more than double the risk of cognitive impairment from the iatrogenic effects of pharmacotherapy. The clinical expression of this interaction is further evidenced by objective behavioral data, such as poorer performance on decision-making tasks among patients experiencing pain, reinforcing the need for integrated cognitive-pain assessment. The impact of opioids on cognitive functions is not uniform and can shift over the course of treatment. While some cognitive effects in non- -cancer pain after drug discontinuation, the picture is complicated by the reversible can be 37 M. Mierniczek et al.: OPIOIDS AND COGNITIVE FUNCTION study development of tolerance. A classic clinical example is tolerance to sedation: many patients who are initially drowsy for the first few days of therapy find that this effect wears off over time.

  generalfuture workevidence 5/5
  Keywords: pain cognitive opioids patient opioid tolerance clinical patients risk induced particularly chronic leads phenomenon cancer
• Real-world patterns of analgesic combination therapy and their associations with pain intensity and treatment modification in patients with chronic non-cancer pain: A retrospective observational study (2026) · Pakistan Journal of Pharmaceutical Sciences · doi

  management of neuropathic pain: An overview and literature update. Mayo Clin. Proc., 85(3 Suppl): S3– 14. the Eriksen J, Sjøgren P, Bruera E, Ekholm O and Rasmussen NK (2006). Critical issues on opioids in chronic non- cancer pain: an epidemiological study. Pain, 125(1-2): 172–9. Farrar JT, Young JP, Jr., Lamoreaux L, Werth JL and Poole MR (2001). Clinical importance of changes in chronic pain intensity measured on an 11-point numerical pain rating scale. Pain, 94(2): 149–158. Finnerup NB, Haroutounian S, Kamerman P, Baron R, Bennett DLH, Bouhassira D, Cruccu G, Freeman R, Hansson P, Nurmikko T, Raja SN, Rice ASC, Serra J, Smith BH, Treede RD and Jensen TS (2016). Neuropathic pain: An updated grading system for research and clinical practice. Pain, 157(8): 1599– 1606. Gatti A, Longo G, Sabato E and Sabato AF (2011). Long- term controlled-release oxycodone and pregabalin in the treatment of non-cancer pain: An observational study. Eur. Neurol., 65(6): 317–322. Gilron I, Bailey JM, Tu D, Holden RR, Jackson AC and Houlden RL (2009). Nortriptyline and gabapentin, alone and in combination for neuropathic pain: A double-blind, randomised controlled crossover trial. Lancet, 374(9697): 1252–61. Gilron I, Baron R and Jensen T (2015). Neuropathic pain: Principles of diagnosis and treatment. Mayo Clin. Proc., 90(4): 532–45.

  generalrecommendationsevidence 5/5
  Keywords: pain neuropathic mayo clin proc chronic cancer clinical baron jensen sabato controlled treatment gilron management
• Multimodal Pharmacologic Strategies for Chronic Cancer Pain: A Systematic Review (2026) · Cureus · doi

  The review was limited by the heterogeneity of the included studies, which precluded meaningful quantitative pooling. The review did not include a meta-analysis due to the lack of clinically coherent comparisons. The studies differed in pharmacological interventions, comparator regimens, cancer populations, pain mechanisms, baseline opioid treatment, treatment duration, outcome measures, responder definitions, and assessment time points.

  generallimitations sectionevidence 5/5
  Keywords: review was limited heterogeneity included studies precluded meaningful
• Fibromyalgia: A Multifactorial Pain Disorder (2026) · International Journal of Molecular Sciences · doi

  diagnosis relies on symptom-based diagnostic criteria that lack objectivity, - direct histopathological evidence in FM remains limited, - small fiber neuropathy is likely to characterize a specific subset of FM, rather than being a universal feature, - opioid use can lead to tolerance development and opioid-induced hyperalgesia, - the study did not reveal clear lesions that would explain the patients' complaints of pain

  generallimitations sectionevidence 5/5
  Keywords: diagnosis relies symptom-based diagnostic criteria lack objectivity direct

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