Relief of Acute Low Back Pain With Naproxen Sodium

In a recent systematic review, nonsteroidal anti-inflammatory drugs (NSAIDs) were shown to be the only pharmacologic treatment supported by moderate-certainty evidence for effective relief of acute low back pain.¹

INTRODUCTION

Effective management of acute low back pain helps patients maintain physical function, emotional well-being, and overall quality of life.^2,3The peer-reviewed journal, American Family Physician, defines acute low back pain as sudden-onset discomfort in the lower back that may radiate to 1 or both legs.⁴ Symptoms typically last up to 4 weeks (or 12 weeks for subacute pain).⁴ The National Center for Health Statistics reports that nearly 40% of US adults experienced some form of back pain within a 3-month period, highlighting its widespread impact.⁵ Most cases (80%-90%) are nonspecific, as a definitive nociceptive source cannot be clinically identified.^6,7,8

Patients can manage acute low back pain through nonpharmacologic approaches, prescription medications, and OTC therapies.^9,10,11 Because low back pain can be long-lasting and often recurs, treatments that provide ongoing symptom control are important.² Understanding treatment approaches allows pharmacists to guide patients in effectively managing acute low back pain.⁴

A recent comprehensive systematic review of randomized clinical trials evaluated both drug and non-drug therapies for low back pain.¹ The review found that most treatments were not efficacious; however, NSAIDs showed moderate evidence of efficacy in acute low back pain.¹ Further, the study found that acetaminophen is not efficacious for acute low back pain.¹

COMMON OTC DRUG TREATMENT OPTIONS

OTC pain relief options commonly chosen by patients include acetaminophen and NSAIDs, such as ibuprofen and naproxen sodium.^9,12,13,14 These therapies are indicated for the temporary relief of minor acute low back pain.^2,13,14 However, acetaminophen and ibuprofen may provide only short-term (4-6 hour) relief per dose.^13,14 In contrast, long-acting naproxen sodium provides up to 12 hours of effective pain relief per dose, supporting pain relief when pain persists.¹²

Mechanisms of Action

NSAIDs, such as ibuprofen and naproxen sodium, act by inhibiting cyclooxygenase (COX) enzymes, reducing the production of eicosanoids that contribute to pain, inflammation, vasodilation, and platelet function.¹⁵ Acetaminophen is a weak COX inhibitor, lacks anti-inflammatory activity, and is, therefore, not classified as an NSAID.¹⁶ The exact mechanism of its analgesic effect is not fully understood, but it is now believed to be mediated by the central nervous system.¹⁶ Exactly how these different pharmacologic mechanisms impact analgesic efficacy in the management of acute low back pain is unclear; however, acetaminophen is no longer a first-line treatment recommendation, and health care professionals are now guided to recommend NSAIDs.¹¹

Dosing and Administration

Patients should use the lowest effective dose and follow label instructions.^12,13,14 Acetaminophen (650 mg) and ibuprofen (200 mg) can be taken every 4 to 6 hours for adults and children 12 years and older, with doses repeated as needed to maintain adequate symptom control.^13,14 Naproxen sodium (220 mg) is approved for adults and children 12 years and older and provides up to 12 hours of pain relief per dose, allowing for less frequent dosing and supporting long-acting pain relief for acute low back pain when pain persists.¹²

NONOPIOID PAIN MANAGEMENT

CDC guidelines recommend nonopioid options, such as NSAIDs, as first-line therapy for acute pain, including low back pain.⁹

DEEP DIVE INTO THE REVIEW ON ACUTE LOW BACK PAIN

A comprehensive systematic review and meta-analysis evaluated 56 nonsurgical, noninterventional treatments for acute nonspecific low back pain in adults (≥ 18 years) across 301 randomized, placebo-controlled trials, from Medline, CINAHL, Embase, PsycInfo, and the Cochrane Central Register of Controlled Trials (through April 14, 2023).¹ Interventions included NSAIDs, acetaminophen, muscle relaxants, opioids, and nonpharmacologic approaches, alone or in combination.¹ Study durations ranged from single-dose to several weeks, with outcomes measured on 0-to-100 pain-intensity scales and stratified by acute (< 12 weeks) versus chronic (≥ 12 weeks) pain.¹ Risk of bias was rated with the PEDro scale (0-10), and certainty of evidence was evaluated using GRADE (Grading of Recommendations Assessment, Development, and Evaluation), ranging from very low to moderate.¹

SUMMARY OF EVIDENCE

NSAIDs

Across 10 trials (N = 1763), NSAIDs were the only treatment category supported by moderate-certainty evidence for significant pain reduction in acute low back pain (mean difference [MD] = –3.8 [95% CI, –5.8 to –1.8]; Table).¹

Acetaminophen

Based on moderate-certainty evidence, acetaminophen was shown to provide little to no pain reduction for acute low back pain (N = 1843 across 2 trials; MD = –2.5 [95% CI, –8.2 to 3.3]) and was not considered efficacious for this condition.¹

Other Pharmacologic Therapies

Prescription muscle relaxants, opioids, and combination therapies (eg, a muscle relaxant plus an NSAID) showed limited or uncertain benefit compared with placebo (muscle relaxants: MD =–13.4 [95% CI, –18.7 to –8.0]; opioids: MD =–24.5 [95% CI, –30.0 to –19.1]; combination: MD =–6.0 [95% CI, –18.8 to 6.8]).¹ The certainty of evidence was very low to moderate for all other pharmacologic interventions, including glucocorticoid injections (MD = 0.4 [95% CI, –11.8 to 12.6]).¹

Nonpharmacologic Therapies

Exercise showed little to no benefit with moderate certainty of evidence (2 studies, N = 412; MD = –4.1 [95% CI, –12.0 to 3.7]). The certainty of evidence was low to very low for other nonpharmacological interventions. Spinal manipulation may provide moderate reductions in pain (4 studies, N = 383; MD = –12.4 [95% CI, –23.2 to –1.6]); massage may provide greater reductions in pain; however, these data must be interpreted with caution due to the low certainty of evidence (1 study, n = 40; MD =–22.0 [95% CI, –34.4 to –9.6]).¹

Conclusion

The review found that only NSAIDs had moderate efficacy in acute low back pain over other treatments.¹

ALEVE

Aleve (naproxen sodium) is a long-acting NSAID indicated for the temporary relief of acute low back pain.¹² A single 220-mg dose provides up to 12 hours of pain relief, allowing patients to maintain symptom control with dosing just twice daily if needed for pain.¹² This long-acting effect supports sustained pain management when pain persists or recurs over time.²

When used as directed, Aleve remains a well-established OTC option for effective and convenient management of acute low back pain.¹² One study demonstrated that it was safe when used as directed, with a low incidence of adverse events.¹⁷ Pooled analyses showed no significant difference in adverse events compared with placebo or other active comparators.¹⁷ Reported events, most commonly affecting the gastrointestinal system, were typically mild to moderate.¹⁷

PHARMACISTS’ ROLE IN ACUTE LOW BACK PAIN

Pharmacists help patients select safe, effective options for acute low back pain. In the comprehensive review, NSAIDs were the only treatment category supported by moderate-certainty evidence for significant pain reduction in acute low back pain, reinforcing their role as a first-line pharmacologic therapy.¹ Among OTC options, Aleve (naproxen sodium) provides significant, long-acting pain relief for up to 12 hours per dose, when used as directed.^1,12 By recommending evidence-supported NSAIDs like Aleve, pharmacists can help patients with acute low back pain achieve long-lasting pain relief.

REFERENCES

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14. Advil (ibuprofen tablet). Prescribing information. National Institutes of Health DailyMed. January 2025. Accessed February 12, 2026. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=772360bd-8631-4d24-b4db-5a7e6e1d9a13
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