Side effects of CBD include nausea, fatigue and irritability. CBD can increase the level in your blood of the blood thinner coumadin, and it can raise levels of certain other medications in your blood by the exact same mechanism that grapefruit juice does. 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 know for 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.
Cannabidiol (CBD) has been recently covered in the media, and you may have even seen it as an add-in booster to your post-workout smoothie or morning coffee. What exactly is CBD? Why is it suddenly so popular?
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, it was able to stop them altogether. Videos of the effects of CBD on these children and their seizures are readily available on the Internet for viewing, and they are quite striking. Recently the FDA approved the first ever cannabis-derived medicine for these conditions, Epidiolex, which contains CBD.
Is CBD safe?
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CBD stands for cannabidiol. It is the second most prevalent of the active ingredients of cannabis (marijuana). While CBD is an essential component of medical marijuana, it is derived directly from the hemp plant, which is a cousin of the marijuana plant. While CBD is a component of marijuana (one of hundreds), by itself it does not cause a "high." 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."
CBD may offer an option for treating different types of chronic pain. A study from the European Journal of Pain showed, using an animal model, CBD applied on the skin could help lower pain and inflammation due to arthritis. Another study demonstrated the mechanism by which CBD inhibits inflammatory and neuropathic pain, two of the most difficult types of chronic pain to treat. More study in humans is needed in this area to substantiate the claims of CBD proponents about pain control.
Some CBD manufacturers have come under government scrutiny for wild, indefensible claims, such that CBD is a cure-all for cancer, which it is not. We need more research but CBD may be prove to be an 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 is currently is mostly available as an unregulated supplement, it’s difficult to know exactly what you are getting. If you decide to try CBD, talk with your doctor — if for no other reason than to make sure it won’t affect other medications you are taking.
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.
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.
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The bottom line: Don’t make CBD your first or only choice for pain relief
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.
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.
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!
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.