Cannabinoids in Chronic Pain Management: A Review of the History, Efficacy, Applications, and Risks

Posted on April 1, 2025 by David

“Background/Objectives: Chronic pain remains a pervasive and challenging public health issue, often resistant to conventional treatments such as opioids, which carry substantial risks of dependency and adverse effects. Cannabinoids, bioactive compounds derived from the Cannabis sativa plant and their synthetic analogs, have emerged as a potential alternative for pain management, leveraging their interaction with the endocannabinoid system to modulate pain and inflammation.

Methods: The current, evolving literature regarding the history, efficacy, applications, and safety of cannabinoids in the treatment of chronic pain was reviewed and summarized to provide the most current review of cannabinoids.

Results: Evidence suggests that cannabinoids provide moderate efficacy in managing neuropathic pain, fibromyalgia, cancer-related pain, and multiple sclerosis-related spasticity. Patient-reported outcomes further indicate widespread perceptions of cannabinoids as a safer alternative to opioids, with potential opioid-sparing effects. However, the quality of existing evidence is limited by small sample sizes and methodological inconsistencies. Regulatory barriers, including the classification of cannabis as a Schedule I substance in the United States, continue to hinder robust research and clinical integration. Moreover, the risks associated with cannabinoids, such as psychiatric effects, addiction potential, and drug interactions, necessitate cautious application.

Conclusions: Cannabinoids represent a promising, albeit complex, alternative for chronic pain management, particularly given the limitations and risks of traditional therapies such as opioids. However, significant deficiencies remain in the research. While smaller trials and systematic reviews indicate therapeutic potential, the quality of evidence is often low due to limited sample sizes, short study durations, and methodological inconsistencies. Large-scale, randomized controlled trials with long-term follow-up are urgently needed to confirm efficacy and safety across diverse patient populations and pain etiologies.”

https://pubmed.ncbi.nlm.nih.gov/40149508/

“The future for cannabis research is bright, and as regulatory frameworks adapt to balance access and oversight, cannabinoids may transition from an experimental adjunct to a well-established option in chronic pain care, provided scientific rigor and evidence-based policymaking remain at the forefront.”

https://www.mdpi.com/2227-9059/13/3/530

Terpene blends from Cannabis sativa are cannabimimetic and antinociceptive in a mouse chronic neuropathic pain model via activation of adenosine A2a receptors

Posted on March 24, 2025 by David

“An increase in the use of medicinal Cannabis for pain management has spurred research into the understudied bioactive compounds in Cannabis, such as terpenes.

In our previous work, we showed that isolated and purified terpenes were cannabimimetic and also relieved chemotherapy-induced peripheral neuropathy (CIPN) pain via activation of Adenosine A_2a Receptors (A_2aR) in the spinal cord. However, terpenes are most often consumed by the public as complex extracts and mixtures, not purified individual terpenes, and whether this cannabimimetic and antinociceptive activity holds true in terpene extracts and blends is not clear.

In this study, we thus extracted terpene blends from three distinct Cannabis chemovars and assessed these blends in male and female CD-1 mice for their cannabimimetic activity in the tetrad assay and pain-relieving properties in a CIPN model.

Each terpene blend was unique in the relative amounts of different terpenes extracted. Though each blend was unique, each similarly elicited cannabimimetic behaviors of catalepsy, hyperlocomotion, and hypothermia, without tail flick analgesia.

All three terpene blends effectively relieved CIPN, though the antinociception was more robust in male than in female mice. This antinociception was recapitulated by purified Myrcene but not D-Limonene. The A_2aR antagonist istradefylline blocked the pain-relieving effects of all three terpene blends, suggesting that the terpene blends act on A_2aR to relieve CIPN pain.

Together, these findings suggest that terpene blends have similar pharmacological effects as purified single terpenes, and that observations made with single terpenes may be applicable to the complex terpene mixtures commonly consumed by the public.”

https://pubmed.ncbi.nlm.nih.gov/40122228/

https://www.sciencedirect.com/science/article/abs/pii/S030439402500093X?via%3Dihub

Cannabidiol reduces neuropathic pain and cognitive impairments through activation of spinal PPARγ

Posted on March 21, 2025 by David

“The purpose of this study was to evaluate the participation of spinal peroxisome proliferator-activated receptor gamma (PPARγ) in the antiallodynic effect of cannabidiol, the expression of PPARγ in sites relevant to the spinal nociceptive processing, and the effect of this cannabinoid on cognitive deficits induced by neuropathic pain in female mice.

Either acute or repeated treatment with cannabidiol reduced tactile allodynia and spontaneous pain (flinching) in female neuropathic mice. Pioglitazone partially reduced tactile allodynia, and this effect was fully blocked by the PPARγ antagonist GW9662. Likewise, intrathecal injection of cannabidiol reduced tactile allodynia, while PPARγ antagonist GW9662 or 5-HT_1A receptor antagonist WAY-100635, but not the PPARα antagonist GW6479, partially prevented this effect. GW9662 and WAY-100635 administrated per se did not modify tactile allodynia in neuropathic female mice. Co-administration of GW9662 and WAY-100635 fully prevented the antiallodynic effect of cannabidiol in mice. Nerve injury up-regulated PPARγ expression at the spinal cord and dorsal root ganglia, while cannabidiol further enhanced nerve injury-induced up-regulation of PPARγ expression in both tissues.

Repeated intrathecal injection of cannabidiol reduced tactile allodynia and several pain makers (ERK, p-ERK, p38MAPK and p-p38MAPK). In addition, this treatment restored nerve injury-induced interleukin-10 down-regulation and increased PPARγ expression at the spinal cord. Repeated treatment with cannabidiol also improved nerve injury-induced cognitive impairment in mice.

These results provide compelling evidence for the involvement of PPARγ in the antiallodynic effect of cannabidiol in mice and highlight its multifaceted therapeutic potential in neuropathic pain management and its comorbidities.

PERSPECTIVE: The present study reveals cannabidiol’s dual effects in female mice by reducing neuropathic pain through spinal PPARγ and 5-HT_1A receptor activation and ameliorating nerve injury-induced cognitive impairment. These findings may assist clinicians seeking new therapeutic approaches for managing neuropathic pain and its associated cognitive deficits.”

https://pubmed.ncbi.nlm.nih.gov/40112940/

https://www.jpain.org/article/S1526-5900(25)00605-4/abstract

Improvement in the Cognitive Function in Chronic Pain: Therapeutic Potential of the Endocannabinoid System

Posted on March 11, 2025 by David

“Chronic pain presents as a complex condition encompassing sensory (Zhang Z et al. Cell Rep 12;752-759, 2015) and emotional components, often accompanied by anxiety, depression, insomnia, and cognitive impairment. These factors significantly hinder daily activities and rehabilitation efforts.

The widespread prevalence of chronic pain imposes substantial clinical, societal, and economic burdens. While current analgesics have limitations and associated side effects such as tolerance, dependency, cognitive deficits, and a narrow therapeutic window, the search for new analgesic options remains imperative.

The endocannabinoid system (ECS), a key modulator in pain processing pathways, plays a crucial role in executive functions. This review specifically focuses on the cognitive impairments associated with chronic pain and highlights the pivotal role of the ECS in the cognitive aspects of pain. Additionally, the effectiveness of cannabinoid-based medications in improving executive functions in patients with chronic pain is evaluated.”

https://pubmed.ncbi.nlm.nih.gov/40059255/

https://link.springer.com/article/10.1007/s12035-025-04814-8

Spinal dorsal horn neurons involved in the alleviating effects of cannabinoid receptor agonists on neuropathic allodynia-like behaviors in rats

Posted on March 11, 2025 by David

“Mechanical allodynia, the pain caused by innocuous tactile stimuli, is a hallmark symptom of neuropathic pain that is often resistant to currently available treatments.

Cannabinoids are widely used for pain management; however, their therapeutic mechanisms for neuropathic mechanical allodynia remain unclear.

Using transgenic rats that enable to optogenetically stimulate touch-sensing Aβ fibers in the skin, we found that the intrathecal administration of the synthetic cannabinoid, WIN 55,212-2, alleviated the Aβ fiber-derived neuropathic allodynia. Furthermore, we injected adeno-associated virus vectors incorporating the rat cannabinoid receptor 1 (CB₁ receptor) (encoded by Cnr1) promoter and tdTomato or short hairpin RNA targeting the CB₁ receptor into the spinal dorsal horn (SDH) and demonstrated that the conditional knockdown of CB₁ receptors in Cnr1⁺ SDH neurons attenuates the anti-allodynic effects of intrathecally administered WIN 55,212-2. Electrophysiological analysis revealed that Cnr1⁺ SDH neurons received excitatory synaptic inputs from the primary afferent Aβ fibers.

Collectively, our results suggest that the CB₁ receptors in Cnr1⁺ SDH neurons are molecular and cellular targets of intrathecal WIN 55,212-2 to alleviate neuropathic allodynia.”

https://pubmed.ncbi.nlm.nih.gov/40058945/

https://linkinghub.elsevier.com/retrieve/pii/S1347861325000180

“WIN 55,212-2 is a chemical described as an aminoalkylindole derivative, which produces effects similar to those of cannabinoids such as tetrahydrocannabinol (THC) “

Evaluation of cannabis-derived anti-inflammatory and analgesic treatment in animals and identification of cannabinoid-based effective inhibition of prostaglandin through computational studies

Posted on March 9, 2025 by David

“Many medical conditions are accompanied by severe pain. Acute pain refers to the experience of pain that lasts for only a few hours, whereas chronic pain is the ongoing emergence of pain signals over an extended period.

Since ancient times, cannabis has been utilized for medical purposes.

This article demonstrates the medicinal importance of cannabinoids through their analgesic and anti-inflammatory activities. Additionally, the mechanisms of cannabinoid-induced analgesia have been interpreted via preclinical investigations in animals. Cannabinoid extracts were formulated into gel and cream at concentrations of 2.5% and 5%.

The cannabis cream showed the highest analgesic activity at 5% compared to methyl salicylate as a control. Moreover, cannabis gel produced a comparable anti-inflammatory effect at 5% against the standard diclofenac sodium.

Molecular docking studies of all cannabinoids were performed to understand their modes of interaction and binding affinities with the cyclooxygenase II receptor. Additionally, molecular dynamics simulation studies were conducted for for both the ligand-free and cannabidiol-bound cyclooxygenase II to validate the in vivo and molecular docking results. During simulations, the stability of the protein was analyzed using root-mean-square deviation and root-mean-square fluctuation. The study of trajectories of the ligand-free and ligand-bound proteins was assessed using radius of gyration and solvent accessible surface area. Molecular mechanics/generalized Born surface area was used to evaluate the free energies of ligand binding. Dynamic cross-correlation matrix, principal component analysis and free energy landscape characterized the conformational changes and relative energies of them, which shows the existence of two metastable conformations in cyclooxygenase II, one of which is possibly the native state with catalytic activity.

In conclusion, the data from this study support the use of medicinal cannabis in the management of pain. To mitigate the suffering of patients experiencing extreme pain, the rational use of cannabis-based drugs merits significant consideration.”

https://pubmed.ncbi.nlm.nih.gov/40048308/

https://www.tandfonline.com/doi/full/10.1080/07391102.2025.2472180

The Pharmacology of Cannabinoids in Chronic Pain

Posted on March 6, 2025 by David

“Background: Our objective was to provide an overview of the currently available scientific and clinical data supporting the use of Cannabis and Cannabis-derived products for the treatment of chronic pain disorders. We also provide information for researchers, clinicians, and patients to be better informed and understand the approach behind the recommendation of Cannabis as a potential adjuvant in the treatment/control of chronic pain. Cannabis and its bioactive compounds have sparked interest in the field of pain treatment in spite of its controversial history and status as a controlled substance in many countries. With the increase in chronic pain, physicians and patients have started to look at alternative ways to treat pain aside from traditional treatments. One alternative is the use of cannabis to reduce/treat chronic pain disorders based on anecdotal accounts and the function of its phytocannabinoids. The two main cannabinoids in cannabis, tetrahydrocannabinol (THC) and cannabidiol, act on CB1 and CB2 receptors (in addition to several additional receptors). It is through these pleiotropic receptor interactions that these compounds elicit their biological function including the reduction of chronic pain. In this narrative review, we included the most recent evidence supporting the use of cannabis in the treatment of chronic pain disorders including chronic neuropathic pain, cancer-induced neuropathic pain, chronic musculoskeletal pain, and chronic headaches and migraines.

Summary: Evidence suggests that cannabis and cannabinoids have an analgesic effect that arises from a combination of compounds and various receptor systems. These effects may be maximized with the use of a combination of cannabinoids. At the same time, the combination of cannabinoids helps minimize the undesirable side effects of some cannabinoids such as the psychoactivity of THC. With these findings, further research is necessary to assess the analgesic properties of other cannabinoids like cannabichromene and cannabigerol and their contributions to the reduction of pain.”

https://pubmed.ncbi.nlm.nih.gov/40046175/

“Cannabis sativa L. has been used as a medicinal remedy for thousands of years. It has gone through multiple periods of acceptance, dismissal/rejection, reacceptance, illegality and, most recently, rediscovery of its potential to address chronic medical conditions. In the last few decades, its recreational use has received growing acceptance, while its medical use has been encouraged in multiple jurisdictions. Most modern research has focused on the phytocannabinoids produced by the plant which have been found to help minimize chronic neuropathic pain and mitigate other disorders including seizure conditions (e.g., Lennox-Gastaut and Dravet syndromes) and spasticity in MS. This review has provided scientific evidence supporting the use of cannabis as an adjuvant in the treatment of chronic pain which could also lead pain reduction to the point of minimizing other pharmacological treatments.”

https://karger.com/mca/article/8/1/31/920366/The-Pharmacology-of-Cannabinoids-in-Chronic-Pain

“Designer cannabinoids could be the key to pain relief without adverse effects”

https://www.nature.com/articles/d41586-025-00546-w

Moroccan Cannabis sativa essential oil attenuates peripheral neuropathic pain induced by chronic sciatic nerve constriction injury in mice

Posted on February 14, 2025 by David

“Ethnopharmacological relevance: Cannabis sativa has been widely used in traditional medicine for its therapeutic properties. However, in Morocco, the ethnobotanical applications of Cannabis sativa, especially its essential oils, are underexplored. This study investigates, for the first time, the effects of Moroccan Cannabis sativa essential oil on peripheral neuropathic pain.

Materials and methods: Peripheral neuropathic pain was induced in mice through sciatic nerve injury. The mice were treated daily with cannabis essential oil for 21 days. Behavioral tests were conducted on days 1, 7, 14, and 21 to evaluate thermal, mechanical, and cold sensitivity. The essential oil’s chemical composition was analyzed using gas chromatography-mass spectrometry (GC/MS).

Results: The main constituents of the essential oil were (E)-caryophyllene (41.59%) and α-humulene (14%). Daily treatment with the essential oil significantly reduced pain sensitivity and improved functional and histological recovery over time. These effects are linked to the activity of the dominant terpenoids in the oil.

Conclusion: Moroccan Cannabis sativa essential oil shows significant therapeutic potential for managing peripheral neuropathic pain. By enhancing recovery and alleviating pain symptoms, it offers a promising alternative for treating chronic pain caused by nerve injuries.”

https://pubmed.ncbi.nlm.nih.gov/39947371/

“A multitude of recent studies have explored the broad biological properties of cannabis. Extracts from Cannabis sativa have demonstrated antimicrobial, anti-inflammatory, antinociceptive, and potent antioxidant activities.”

“This study examined the analgesic effects of terpenes found in Cannabis sativa essential oil on neuropathy. The results showed that chronic administration of these bioactive terpenes, specifically β-caryophyllene, α-humulene, and caryophyllene oxide, significantly increased pain sensitivity and response time in mice with neuropathy. Although morphine and THC-based treatments are commonly used to relieve neuropathic pain, these terpenes may offer a promising alternative with limited side effects. Clinical research has demonstrated the efficacy of cannabis-based treatments, leading several pain societies to recommend them for neuropathy management. “

https://www.sciencedirect.com/science/article/pii/S0378874125001692?via%3Dihub

The cannabinoid CB2 receptor mediates the analgesic effects of Cannabis sativa extract in a rat model of neuropathic pain

Posted on February 14, 2025 by David

“Neuropathic pain (NP) is a complex and debilitating condition that is often refractory to currently available analgesic medications.

Cannabis sativa extract (CSE) has been reported to exhibit analgesic properties across various pain models; however, the underlying mechanisms of action are not fully understood.

This study aimed to investigate the involvement of the cannabinoid CB2 receptor in mediating the analgesic effects of CSE in a rat model of NP, where NP was induced in male Wistar rats through chronic constriction injury (CCI) of the sciatic nerve.

Rats were randomly allocated into four groups: (1) Sham + vehicle, (2) CCI + vehicle, (3) CCI + CSE, and (4) CCI + CSE + AM630 (a CB2 receptor antagonist). CSE was administered intraperitoneally at a dosage of 30mg/kg once daily for 7 days, starting from day 7 to day 13 post-CCI surgery. To assess the involvement of the CB2 receptor, 7µg of AM630 was administered intrathecally to the rats in group 4, 30minutes before the CSE injections. Mechanical allodynia and thermal hyperalgesia were assessed using the von Frey filament and hot plate tests, respectively, at baseline (day 0) and on days 3, 7, 10, and 14 after surgery. Additionally, at the end of the study period (day 14), the expression level of Iba1 and GFAP genes was quantified in the lumbar enlargement tissues using real-time PCR.

The results demonstrated that CCI surgery induced mechanical allodynia and thermal hyperalgesia, along with the upregulation of Iba1 and GFAP genes in the vehicle-treated CCI group. Treatment with CSE significantly mitigated both allodynia and hyperalgesia and downregulated the expression of Iba1 and GFAP genes compared to the CCI + vehicle group. Furthermore, the administration of the CB2 receptor antagonist AM630 not only robustly blocked the antinociceptive effects of CSE but also reversed the significant downregulation of Iba1 and GFAP gene expression in the lumbar enlargement tissues.

These findings highlight the novel role of the CB2 receptor in mediating the analgesic effects of CSE, providing new insights into the potential therapeutic mechanisms of CSE in neuropathic pain management.”

https://pubmed.ncbi.nlm.nih.gov/39947333/

“In summary, this study provides evidence that CSE exerts analgesic and anti-inflammatory effects in NP through CB2 receptor activation. These findings contribute to the growing body of research supporting cannabinoids as potential therapeutic agents for NP management.”

https://www.sciencedirect.com/science/article/abs/pii/S0166432825000683?via%3Dihub

The comparative effectiveness of medicinal cannabis for chronic pain versus prescription medication treatment

Posted on January 29, 2025 by David

“Reviews of the effectiveness of medicinal cannabis for chronic pain vary in their conclusions. IASP has identified that a key missing evidence in this debate is data from observational cohort studies, analyzed with comparative effectiveness methods.

In a medically supervised context to the use of marijuana for chronic pain, we identified 440 patients certified for medical marijuana by pain specialists in a single healthcare system. They were characterized by a battery of patient-reported outcomes stored electronically in the University of Pittsburgh Patient Outcomes Repository for Treatment (PORT).

At 3 months, 38.6% were responders, based on clinically meaningful improvements in pain, function, or global impression of change, and maintained this response at 6 months. In the 157 patients who were coprescribed opioids, at 6 months there was a mean 39.3% decrease in morphine milligram equivalents (P < 0.05 for the difference vs baseline).

In addition, 8114 patients treated in the same pain clinics with prescription pain medications instead (nonopioid or opioid) during the same timeframe were selected from PORT as a control group for comparison. They had a 34.9% rate of response at 3 months. Using the causal inference method of stratified modeling, logistic regression revealed an odds ratio of 2.6 in favor of medical marijuana vs medication treatment (P < 0.01). Potential harms data were not available in the PORT registry.

Medical marijuana was comparatively more effective than prescription medications for the treatment of chronic pain at 3 months, although the populations compared were slightly different.”

https://pubmed.ncbi.nlm.nih.gov/39878633/

https://journals.lww.com/pain/abstract/9900/the_comparative_effectiveness_of_medicinal.807.aspx

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Category Archives: Chronic Inflammatory and Neuropathic Pain