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Medical research for cbd oil for leg pain

CBD for chronic pain: The science doesn’t match the marketing

If you ask health care providers about the most challenging condition to treat, chronic pain is mentioned frequently. By its nature, chronic pain is a complex and multidimensional experience. Pain perception is affected by our unique biology, our mood, our social environment, and past experiences. If you or a loved one is suffering from chronic pain, you already know the heavy burden.

People are looking for novel, nonaddictive ways to treat pain

Given the ongoing challenges of chronic pain management coupled with the consequences of the opioid epidemic, pain management practitioners and their patients are searching for effective and safer alternatives to opioids to alleviate pain. With the legalization of marijuana in many states and resulting cultural acceptance of this drug for recreational and medical use, there has been an increased interest in using cannabis for a myriad of medical problems, including pain.

Cannabis (most commonly obtained from the Cannabis indica and Cannabis sativa plants) has three major components: cannabinoids, terpenoids, and flavonoids. While there are over a hundred different cannabinoids, the two major components are tetrahydrocannabional (THC) and cannabidiol (CBD). Historically more attention has been paid to the psychoactive (euphoric “getting high”) component of the cannabis plant, THC; there have been fewer scientific studies on the medical use of CBD, a non-psychoactive component of the plant.

What’s the thinking behind using cannabis for chronic pain?

CBD is emerging as a promising pharmaceutical agent to treat pain, inflammation, seizures, and anxiety without the psychoactive effects of THC. Our understanding of the role of CBD in pain management continues to evolve, and evidence from animal studies has shown that CBD exerts its pain-relieving effects through its various interactions and modulation of the endocannabinoid, inflammatory, and nociceptive (pain sensing) systems. The endocannabinoid system consists of cannabinoid receptors that interact with our own naturally occurring cannabinoids. This system is involved in regulating many functions in the body, including metabolism and appetite, mood and anxiety, and pain perception.

What’s the research that CBD works in humans?

Given its promising results in animal models, along with its relative safety, non-psychoactive properties, and low potential for abuse, CBD is an attractive candidate to relieve pain. Unfortunately, there is a lack of human studies about the effectiveness of CBD. However, there is an abundance of commercial advertisements about the magical effects of CBD, and it is frequently presented as a cure-it-all potion that will treat everything including diabetes, depression, cancer, chronic pain, and even your dog’s anxiety!

So far, pharmaceutical CBD is only approved by the FDA as adjunct therapy for the treatment of a special and rare form of epilepsy. Currently, CBD alone is not approved for treatment of pain in the United States. But a combination medication (that contains both THC and CBD in a 1:1 ratio) was approved by Health Canada for prescription for certain types of pain, specifically central neuropathic pain in multiple sclerosis, and the treatment of cancer pain unresponsive to optimized opioid therapy. There is currently no high-quality research study that supports the use of CBD alone for the treatment of pain.

Why is CBD presented to the public this way, when it is not without risks?

Given the rapid change in the legality of cannabis coupled with the increased appetite for something new, and driven by unprecedented profit margins, the advertising for cannabinoids in general and CBD in particular has gone wild. The FDA is very clear that it is illegal to market CBD by adding it to a food or labeling it as a dietary supplement. And it warns the public about its potential side effects, as it’s often advertised in a way that may lead people to mistakenly believe using CBD “can’t hurt.” CBD can cause liver injury, and can affect the male reproductive system (as demonstrated in laboratory animal studies).

Most importantly, CBD can interact with other important medications like blood thinners, heart medications, and immunosuppressants (medications given after organ transplantation), potentially changing the levels of these important medications in the blood and leading to catastrophic results, including death. Also, more information needs to be gathered about its safety in special populations such as the elderly, children, those who are immunocompromised, and pregnant and breastfeeding women.

Many of the CBD products on the market are unregulated

In fact, the FDA has issued several warning letters to companies and individuals that market unapproved new drugs that allegedly contain CBD. The FDA has tested the chemical content of cannabinoid compounds in some of the products, and many were found to not contain the levels of CBD the manufacturers had claimed they contain.

Beware of powerful testimonials

Finally, there is anecdotal wisdom, when experiences by patients and health professionals have positive results. While the experience or medication could be beneficial, that doesn’t mean it is going to work for everyone. That’s because each and every person is unique, and what works perfectly for one patient could have no effect on another patient. This is especially true for pain, where many other factors (our mood and stress level, our environment and other medical conditions, and our previous experiences) can affect the perception of pain. Please be careful, and keep in mind that some of these incredible-sounding testimonials are merely marketing materials meant to lure consumers to buy more products, as the CBD market is expected to hit $20 billion by 2024.

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The bottom line: Don’t make CBD your first or only choice for pain relief

If you or someone close to you is considering trying CBD, I would recommend Dr. Robert Shmerling’s advice about the dos and don’ts in choosing an appropriate product. Until there is high-quality scientific evidence in humans, it is difficult to make a recommendation for the regular use of CBD in chronic pain management.

About the Author

Shafik Boyaji, MD , Contributor

Dr. Boyaji earned his medical degree from University of Aleppo, Syria. He completed an Internal Medicine residency at Michigan State University and an Anesthesiology residency at the Brigham and Women’s Hospital. Currently he is in fellowship … See Full Bio

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Comments

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How To Use CBD To Help Manage Pain

Dr. Bindiya Gandhi is an integrative medicine physician with expertise in functional and holistic medicine based in Atlanta, Georgia.

Commissions we earn from partner links on this page do not affect our opinions or evaluations. Our editorial content is based on thorough research and guidance from the Forbes Health Advisory Board.

Table of Contents

  • CBD for Pain Relief
  • CBD for Chronic Pain
  • CBD for Arthritis and Joint Pain
  • CBD for Neuropathic Pain

Without the intoxicating properties of its cousin delta-9-tetrahydrocannabinol (THC), cannabidiol (CBD) can provide the human body with a handful of health benefits. Cannabinoids like CBD interact with receptors in the endocannabinoid system, which plays a role in signaling bodily functions, from emotional responses to motor control to energy balance [1] Mouslech Z, Valla V. Endocannabinoid system: An overview of its potential in current medical practice. Neuro Endocrinol Lett. 2009;30(2):153-179. .

Over the last two decades, scientists have tested CBD’s efficacy as an analgesic, or painkiller, specifically—and with promising results. While research is ongoing, here’s what we know so far about how we can use CBD oil for pain relief.

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CBD for Pain Relief

For now, no CBD-based medications are approved as painkillers in the U.S. Epidiolex, which is used for rare forms of epilepsy, is the only CBD treatment approved by the Food and Drug Administration (FDA).

Meanwhile, several countries have approved CBD to treat certain conditions. For instance, the U.K. approved it for multiple sclerosis, and Canada approved it for cancer pain. Ongoing research suggests CBD oil for pain can aid medical conditions, including arthritis and fibromyalgia, at varying doses. Some pain may not be treatable by CBD alone, but it can help when paired with THC or Western medication applications.

Interestingly, 60% of U.S. adults who use CBD products do so for its potential pain-relieving effects, according to a recent Forbes Health survey of 2,000 U.S. adults conducted by OnePoll.

What’s more, 60% of U.S. adults have tried CBD and believe it has medicinal benefits.

CBD for Chronic Pain

Chronic pain is defined as any pain lasting longer than several months. Studies have found CBD, often alongside THC, to be an effective pain reliever for various chronic conditions.

In clinical trials, Sativex, a spray with equal parts CBD and THC, proved significantly successful as an analgesic for cancer-related pain [2] Russo EB. Cannabinoids in the management of difficult to treat pain. Ther Clin Risk Manag. 2008;4(1):245-259. . The spray, also used for multiple sclerosis-related pain, is approved in Canada to treat cancer pain and is currently undergoing trials for approval and use in the U.S.

A 2019 study found Sativex to be an “effective and well-tolerated add-on treatment” for patients with severe chronic pain stemming from various ailments. The study identified three types of pain: nociceptive (affecting body tissue), neuropathic (affecting nerves) and mixed pain. Sativex helped treat all three kinds but proved especially effective against neuropathic pain.

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An earlier study also found CBD to be effective in chronic pain relief for conditions like multiple sclerosis and spinal cord injury, although across a much smaller sample size [4] Wade DT, Robson P, House H, Makela P, Aram J. A preliminary controlled study to determine whether whole-plant cannabis extracts can improve intractable neurogenic symptoms. Clin Rehabil. 2003;17(1):21-29. .

CBD for Arthritis and Joint Pain

Arthritis is a broad term that encompasses hundreds of joint-related conditions and pains. Common symptoms include swelling, pain and stiffness in the joints and may progress over time.

Already a proven analgesic for other conditions, CBD shows promise as an anti-inflammatory substance in both animal and preclinical trials, which bodes well for arthritis treatment [5] Nichols JM, Kaplan BLF. Immune Responses Regulated by Cannabidiol. Cannabis Cannabinoid Res. 2020;5(1):12-31. [6] Mlost J, Bryk M, Starowicz K. Cannabidiol for Pain Treatment: Focus on Pharmacology and Mechanism of Action. Int J Mol Sci. 2020;21(22):8870. [7] Kosgodage US, Mould R, Henley AB, et al. Cannabidiol (CBD) Is a Novel Inhibitor for Exosome and Microvesicle (EMV) Release in Cancer. Front Pharmacol. 2018;9:889. [8] Lowin T, Tingting R, Zurmahr J, Classen T, Schneider M, Pongratz G. Cannabidiol (CBD): a killer for inflammatory rheumatoid arthritis synovial fibroblasts. Cell Death Dis. 2020;11(8):714. . However, clinical research dedicated to CBD administration for arthritis is less robust and ongoing.

The first controlled trial conducted in 2006 focused on patients with rheumatoid arthritis, an autoimmune disease that causes inflammation in the joints and other affected areas [9] Blake DR, Robson P, Ho M, Jubb RW, McCabe CS. Preliminary assessment of the efficacy, tolerability and safety of a cannabis-based medicine (Sativex) in the treatment of pain caused by rheumatoid arthritis. Rheumatology (Oxford). 2006;45(1):50-52. . Researchers found that, compared to a placebo, Sativex significantly improved participants’ pain during movement, pain at rest and quality of sleep. Any adverse reactions to the treatment were mild or moderate, and there were no complications with withdrawal.

In 2018 researchers tested the efficacy of topical CBD gel on participants with osteoarthritis-related knee pain over the course of 12 weeks [10] Hunter D, Oldfield G, Tich N, Messenheimer J, Sebree T. Synthetic transdermal cannabidiol for the treatment of knee pain due to osteoarthritis. Osteoarthritis and Cartilage. 2018;26:S26. . Participants used either 250 milligrams or 500 milligrams, split into two applications, daily. Overall, participants’ weekly pain levels didn’t improve much with CBD compared to placebo. However, when researchers evaluated the average weekly worst pain scores and Western Ontario and McMaster Universities Arthritis Index (WOMAC) physical function scores, participants who applied 250 milligrams of CBD daily experienced significant improvement over placebo participants.

Meanwhile, a small 2019 trial suggests a mix of CBD and THC may prove beneficial for people with fibromyalgia, a type of arthritis that results in whole-body pain and fatigue [11] van de Donk T, Niesters M, Kowal MA, Olofsen E, Dahan A, van Velzen M. An experimental randomized study on the analgesic effects of pharmaceutical-grade cannabis in chronic pain patients with fibromyalgia. Pain. 2019;160(4):860-869. . The study found that, via a single inhalation, a CBD-THC solution performed better than a placebo and either substance on its own.

CBD for Neuropathic Pain

Various conditions and injuries that damage nerves or the nervous system can result in neuropathic pain. This kind of pain manifests as tingling, numbness, muscle weakness and a sharp, shooting, burning or stabbing pain.

Multiple sclerosis (MS) is a common cause of neuropathic pain. The disease wears down myelin, a mixture of proteins and phospholipids that coats nerve cells. Sativex is already approved as an MS treatment around the world due to its success in clinical trials. As a spray, Sativex is absorbed in the mouth. Studies support a median dose of eight sprays a day for patients with MS, which provides about 20 milligrams of CBD and 21.6 milligrams of THC [12] Sativex Oromucosal Spray – Summary of Product Characteristics (SmPC). Datapharm. Accessed 7/9/2021. . However, doses vary between patients, and each person needs to find their optimal dose.

A 2020 study also tested topically administered CBD oil as a treatment for patients with peripheral neuropathy, or damage to the peripheral nervous system, which sends information throughout your body from the central nervous system [13] Xu DH, Cullen BD, Tang M, Fang Y. The Effectiveness of Topical Cannabidiol Oil in Symptomatic Relief of Peripheral Neuropathy of the Lower Extremities. Curr Pharm Biotechnol. 2020;21(5):390-402. . When compared to placebo, the topical CBD significantly reduced patients’ intense pain and sharp pain, as well as cold and itchy sensations.

Cannabidiol (CBD)-what we know and what we don’t

Cannabidiol (CBD) is often covered in the media, and you may see it touted as an add-in booster to your post-workout smoothie or morning coffee. You can even buy a CBD-infused sports bra. But what exactly is CBD? And why is it so popular?

How is cannabidiol different from marijuana, cannabis and hemp?

CBD, or cannabidiol, is the second most prevalent active ingredient in cannabis (marijuana). While CBD is an essential component of medical marijuana, it is derived directly from the hemp plant, a cousin of marijuana, or manufactured in a laboratory. One of hundreds of components in marijuana, CBD does not cause a “high” by itself. According to a report from the World Health Organization, “In humans, CBD exhibits no effects indicative of any abuse or dependence potential…. To date, there is no evidence of public health related problems associated with the use of pure CBD.”

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Is cannabidiol legal?

CBD is readily obtainable in most parts of the United States, though its exact legal status has been in flux. All 50 states have laws legalizing CBD with varying degrees of restriction. In December 2015, the FDA eased the regulatory requirements to allow researchers to conduct CBD trials. In 2018, the Farm Bill made hemp legal in the United States, making it virtually impossible to keep CBD illegal – that would be like making oranges legal, but keeping orange juice illegal.

The Farm Bill removed all hemp-derived products, including CBD, from the Controlled Substances Act, which criminalizes the possession of drugs. In essence, this means that CBD is legal if it comes from hemp, but not if it comes from cannabis (marijuana) – even though it is the exact same molecule. Currently, many people obtain CBD online without a medical marijuana license, which is legal in most states.

The evidence for cannabidiol health benefits

CBD has been touted for a wide variety of health issues, but the strongest scientific evidence is for its effectiveness in treating some of the cruelest childhood epilepsy syndromes, such as Dravet syndrome and Lennox-Gastaut syndrome (LGS), which typically don’t respond to antiseizure medications. In numerous studies, CBD was able to reduce the number of seizures, and, in some cases, stop them altogether. Epidiolex, which contains CBD, is the first cannabis-derived medicine approved by the FDA for these conditions.

Animal studies, and self-reports or research in humans, suggest CBD may also help with:

    Studies and clinical trials are exploring the common report that CBD can reduce anxiety.
  • Insomnia. Studies suggest that CBD may help with both falling asleep and staying asleep.
  • Chronic pain. Further human studies are needed to substantiate claims that CBD helps control pain. One animal study from the European Journal of Pain suggests CBD could help lower pain and inflammation due to arthritis when applied to skin. Other research identifies how CBD may inhibit inflammatory and neuropathic pain, which are difficult treat.
  • Addiction. CBD can help lower cravings for tobacco and heroin under certain conditions, according to some research in humans. Animal models of addiction suggest it may also help lessen cravings for alcohol, cannabis, opiates, and stimulants.

Is CBD safe?

Side effects of CBD include nausea, fatigue and irritability. CBD can increase the level of blood thinning and other medicines in your blood by competing for the liver enzymes that break down these drugs. Grapefruit has a similar effect with certain medicines.

People taking high doses of CBD may show abnormalities in liver related blood tests. Many non-prescription drugs, such as acetaminophen (Tylenol), have this same effect. So, you should let your doctor know if you are regularly using CBD.

A significant safety concern with CBD is that it is primarily marketed and sold as a supplement, not a medication. Currently, the FDA does not regulate the safety and purity of dietary supplements. So, you cannot be sure that the product you buy has active ingredients at the dose listed on the label. In addition, the product may contain other unknown elements. We also don’t know the most effective therapeutic dose of CBD for any particular medical condition.

How can CBD be taken?

CBD comes in many forms, including oils, extracts, capsules, patches, vapes, and topical preparations for use on skin. If you’re hoping to reduce inflammation and relieve muscle and joint pain, a topical CBD-infused oil, lotion or cream – or even a bath bomb — may be the best option. Alternatively, a CBC patch or a tincture or spray designed to be placed under the tongue allows CBD to directly enter the bloodstream.

Outside of the US, the prescription drug Sativex, which uses CBD as an active ingredient, is approved for muscle spasticity associated with multiple sclerosis and for cancer pain. Within the US, Epidiolex is approved for certain types of epilepsy and tuberous sclerosis.

The bottom line on cannabidiol

Some CBD manufacturers have come under government scrutiny for wild, indefensible claims, such that CBD is a cure-all for cancer or COVID-19, which it is not. We need more research but CBD may prove to be a helpful, relatively non-toxic option for managing anxiety, insomnia, and chronic pain. Without sufficient high-quality evidence in human studies, we can’t pinpoint effective doses, and because CBD currently is typically available as an unregulated supplement, it’s hard to know exactly what you are getting.

If you decide to try CBD, make sure you are getting it from a reputable source. And talk with your doctor to make sure that it won’t affect any other medicines you take.