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Am Fam Physician. 2021;103(9):561-565

This clinical content conforms to AAFP criteria for CME.

Author disclosure: No relevant financial affiliations.

Key Clinical Issue

What are the effects of nonopioid drugs on pain, function, and quality of life in patients with specific types of chronic pain, and what are the adverse events related to these drugs?

Evidence-Based Answer

People with chronic neuropathic pain and fibromyalgia reported small short-term improvements in pain and function with certain anticonvulsants and moderate short-term improvement with certain antidepressants. (Strength of Recommendation [SOR]: B, based on inconsistent or limited-quality patient-oriented evidence.) Non-steroidal anti-inflammatory drugs (NSAIDs) produced small short-term improvements in pain and function in patients with inflammatory arthritis and osteoarthritis. (SOR: B, based on inconsistent or limited-quality patient-oriented evidence.) Memantine and serotonin-norepinephrine reuptake inhibitor (SNRI) antidepressants were beneficial in the intermediate term for treating fibromyalgia. (SOR: B, based on inconsistent or limited-quality patient-oriented evidence.) SNRIs were also beneficial for treating low back pain. (SOR: B, based on inconsistent or limited-quality patient-oriented evidence.) Evidence was insufficient to draw conclusions about long-term effects of any treatments.1

ConditionDrugShort-term painIntermediate-term painLong-term painShort-term functionIntermediate-term functionLong-term functionShort-term quality of lifeIntermediate-term quality of life
Antidepressants
Neuropathic painDuloxetine vs. placeboModerate ● ● ○No evidenceSmall ● ○ ○No evidenceSmall ● ● ○No evidence
FibromyalgiaDuloxetine/milnacipran vs. placeboSmall ● ● ○Small ● ●○Small ● ● ○None ● ● ○Small/none* ● ● ○Small ● ● ○
OsteoarthritisDuloxetine vs. placeboSmall ● ● ●No evidenceSmall ● ● ●No evidenceSmall ● ● ●No evidence
Low back painDuloxetine vs. placeboSmall ● ● ○No evidenceNone ● ● ○No evidenceNone ● ● ○No evidence
Amitriptyline vs. placeboNo evidenceNone ● ○ ○No evidenceNone ● ○ ○No evidenceNo evidence
Amitriptyline vs. pregabalinSmall ● ○ ○No evidenceNone ● ○ ○No evidenceNo evidenceNo evidence
Anticonvulsants
Neuropathic painPregabalin/gabapentin vs. placeboSmall ● ● ○None ● ○ ○None ● ○ ○
Oxcarbazepine vs. placeboSmall ● ● ○No evidenceNone ● ○ ○
Pregabalin vs. gabapentinInsufficient evidenceNo evidenceNo evidence
Pregabalin vs. gabapentin enacarbilNone ● ○ ○None ● ○ ○None ● ○ ○
FibromyalgiaPregabalin/gabapentin vs. placeboSmall ● ● ○Small ● ● ○None ● ● ○
NSAIDs
OsteoarthritisNSAID vs. placeboSmall ● ● ○No evidenceNo evidenceSmall ● ● ●No evidenceNo evidenceNone ● ● ○
Diclofenac vs. celecoxibModerate ● ○ ○No evidenceNo evidenceModerate ● ○ ○No evidenceNo evidenceNo evidence
NSAID vs. NSAIDNone ● ○ ○None ● ○ ○None ● ○ ○None ● ○ ○None ● ○ ○No evidenceNo evidence
Topical diclofenac vs. placeboSmall ● ● ○No evidenceNo evidenceNone ● ○ ○No evidenceNo evidenceNo evidence
Inflammatory arthritisNSAID vs. placeboSmall/moderate ● ● ○Small ● ○ ○Large ● ○ ○Small ● ● ○Small ● ○ ○None ● ○ ○Insufficient evidence
Celecoxib vs. diclofenacNone ● ● ○No evidenceNo evidenceNone ● ● ○No evidenceNo evidenceNo evidence
Celecoxib vs. naproxenNone ● ○ ○No evidenceNo evidenceNone ● ○ ○No evidenceNo evidenceNone ● ○ ○
Diclofenac vs. meloxicamNone ● ○ ○No evidenceNo evidenceNone ● ○ ○No evidenceNo evidenceNo evidence
Meloxicam vs. naproxenNo evidenceNone ● ○ ○No evidenceNo evidenceNo evidenceNo evidenceNo evidence
Nabumetone vs. naproxenNone ● ○ ○None ● ○ ○No evidenceNone ● ○ ○No evidenceNo evidenceNo evidence
Other drugs
Neuropathic painCapsaicin patchNone ● ● ○No evidenceNo evidenceNo evidenceNo evidenceNo evidence
CannabisNone ● ○ ○No evidenceNone ● ○ ○No evidenceNone ● ○ ○No evidence
FibromyalgiaMemantineNo evidenceModerate ● ○ ○No evidenceModerate ● ○ ○No evidenceModerate ● ○ ○
CyclobenzaprineNo evidenceNone ● ○ ○No evidenceInsufficient evidenceNo evidenceNo evidence
OsteoarthritisAcetaminophenNone ● ○ ○None ● ○ ○None ● ○ ○None ● ○ ○No evidenceNo evidence

Practice Pointers

Chronic pain is defined by the International Association for the Study of Pain as ongoing or recurrent pain that lasts beyond the usual course of acute illness or injury or more than three to six months and adversely affects well-being.2 A simpler definition is pain that persists past normal healing time.3 Management options include nonopioid pharmacologic treatments, nonpharmacologic therapy, and opioids. The Centers for Disease Control and Prevention's 2016 guidelines state that when benefits outweigh risks, nonopioid pharmacologic therapies are preferred and should be combined with nonpharmacologic therapy to reduce chronic pain and improve function.4

The Agency for Healthcare Research and Quality (AHRQ) review focused on seven common chronic pain conditions (neuropathic pain, fibromyalgia, osteoarthritis, inflammatory arthritis, low back pain, chronic headache, and sickle cell disease) and assessed the effectiveness of common nonopioid medications on the primary outcomes of pain, function, and quality of life, as well as adverse events related to these medications. The review included oral agents, topical agents, and medical cannabis.

Treatment outcomes were analyzed at three to six months (short term), six to 12 months (intermediate term), and 12 months or later (long term). The review included 25 randomized controlled trials rated as good quality, 129 rated as fair quality, and 30 rated as poor quality. Meta-analyses were conducted when possible. The mean age of the participants was 59 years, and two-thirds of participants were women. Mean pain duration was 7.9 years, with a mean pain severity of 6 out of 10. Pain outcomes were standardized to a scale of 0 to 10, with effect size defined as small (0.5 to 1 point), moderate (more than 1 to 2 points), or large (more than 2 points). Inferences for function were limited by the heterogeneous measures used across studies.

For neuropathic pain (mainly diabetic peripheral neuropathy and postherpetic neuralgia), the anticonvulsants gabapentin, pregabalin, and oxcarbazepine produced small improvements in pain in the short term compared with placebo. The SNRI duloxetine resulted in moderate improvements in short-term pain and small improvements in short-term function and quality of life compared with placebo for people with diabetic peripheral neuropathy. Tricyclic antidepressants, capsaicin patch, and medical cannabis had no clear effects.

The AHRQ review found that treatment with memantine resulted in moderate intermediate-term improvements in pain, function, and quality of life for fibromyalgia. Treatment with the SNRIs duloxetine and milnacipran resulted in small short- and intermediate-term improvements in pain, with small short-term improvement in function compared with placebo. The anticonvulsants pregabalin and gabapentin showed short-term improvements in pain and function compared with placebo, but not quality of life. Cyclobenzaprine and tricyclic antidepressants had no clear effects.

For patients with osteoarthritis, duloxetine resulted in a small improvement in short-term pain response, function, and quality of life compared with placebo. NSAIDs resulted in small improvements in pain and function in the short term, particularly in patients with knee pain and those with higher baseline pain severity. Notable differences between NSAIDs were that oral diclofenac improved pain and function moderately compared with celecoxib in the short term, but intermediate-term pain effects were maintained with celecoxib, and topical diclofenac showed a small improvement in short-term pain but no change in function. Acetaminophen did not improve pain, function, or quality of life in this patient population.

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The Agency for Healthcare Research and Quality (AHRQ) conducts the Effective Health Care Program as part of its mission to produce evidence to improve health care and to make sure the evidence is understood and used. A key clinical question based on the AHRQ Effective Health Care Program systematic review of the literature is presented, followed by an evidence-based answer based on the review. AHRQ’s summary is accompanied by an interpretation by an AFP author that will help guide clinicians in making treatment decisions.

This series is coordinated by Kenny Lin, MD, MPH, deputy editor. A collection of Implementing AHRQ Effective Health Care Reviews published in AFP is available at https://www.aafp.org/afp/ahrq.

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