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CBD drug interactions: Is CBD safe to take with prescription medications?

If you’ve visited a store that sells health and beauty products lately, you may have noticed that products containing CBD, or cannabidiol, seem to be all the rage. Oil, chocolate, supplements, even carbonated beverages, are filling up shelves—enticing shoppers with claims that using one of these products will cure insomnia, alleviate anxiety, reduce inflammation, or treat PTSD.

And shoppers are buying it, so to speak—one recent report indicated that CBD sales are expected to hit $16 billion by 2026, up from just over $1 billion in 2018. But what exactly is CBD, and is it safe for people who are using prescription medications? Before using it, it’s important to learn about the potential CBD drug interactions.

Is CBD marijuana?

While CBD is one of the active ingredients in marijuana, using CBD itself will not get you high (the component that does that is called tetrahydrocannabinol, or THC). CBD is really just a molecule within the hemp variety of the cannabis plant, and there is at least some anecdotal evidence and preliminary research suggesting that the extraction created from this molecule has some health benefits.

CBD is thought to act on certain receptors in your brain and other parts of the body, in ways that could relieve pain, or help certain health conditions, like childhood seizure disorders. However, as with any “natural” product, the fact that it comes from plants doesn’t automatically render it innocuous. For some people, particularly those taking certain prescription medications, using CBD is risky. It has anticoagulant effects that can thin blood; it can also modestly lower blood pressure. These effects could be dangerous for people with certain medical conditions.

“Herbal products are drugs,” says Rita Alloway, Pharm.D. , research professor of nephrology at the University of Cincinnati College of Medicine. “Just because [something] is herbal … doesn’t mean it can’t interact with any of the pharmaceutically manufactured drugs that you may be taking.”

Does CBD interact with medications?

Case in point: tacrolimus , an immunosuppressive medication used to prevent organ rejection in patients who have had heart, liver, or kidney transplants. CBD interferes with the metabolism of tacrolimus, according to research conducted by Dr. Alloway , who specializes in post-transplant immunosuppression. And because tacrolimus is a narrow therapeutic index drug (meaning the window between efficacy and toxicity is very small), this interference can lead to clinically significant negative outcomes (such as kidney problems or organ rejection), she says.

Are the concentrations in commercially available CBD high enough to cause this interaction? The evidence doesn’t really say one way or another. Dr. Alloway’s research involved a high dosage of CBD that wouldn’t be found in a retail product. However, it “highlights that a drug interaction is there,” she says. Plus, tacrolimus is metabolized in the body by a group of enzymes called cytochrome P450 and CBD is a known inhibitor of this process. What does that mean? If CBD inhibits the metabolism of tacrolimus, the patient can end up with too-high levels of tacrolimus in the body. In light of this, she urges anyone taking tacrolimus to speak with their transplant team before using CBD. Don’t get your hopes up, though—using herbal remedies, particularly those with potential interactions, is generally frowned upon by doctors looking after transplant recipients (including Dr. Alloway).

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As for other drugs, well, most haven’t been studied yet. There is preliminary evidence that CBD could have a similar effect to grapefruit juice, impairing how your body metabolizes drugs, and raising serum levels of those medications in your body. And, because cytochrome P450 is responsible for the metabolism of numerous medications , proceed with caution before mixing any prescription pharmaceutical with CBD, Dr. Alloway says.

How about CBD’s therapeutic benefits?

Despite the not-so-great news about CBD for patients using tacrolimus, for some people, CBD is actually life-changing in a positive way. In 2018, for example, the CBD-derived medication Epidiolex received FDA approval for the treatment of Lennox-Gastaut syndrome and Dravet syndrome, two very rare and very severe forms of epilepsy.

But claims that CBD aids in the treatment of certain mental health and psychiatric conditions, don’t pass muster, says Roger McIntyre, MD , professor of psychiatry and pharmacology at the University of Toronto.

“There is no role right now for CBD in managing mental disorders that I [treat], such as depression, bipolar disorder … anxiety and ADHD,” he says. “We just don’t have the evidence that supports [it].”

Furthermore, most prescription medications used to manage these conditions are metabolized by cytochrome P450, making it entirely possible that CBD could interfere with—rather than enhance—treatment.

Dr. McIntrye, who co-authored a 2018 study that concluded that healthcare providers need more information about drug-drug interactions with CBD and psychotropic medication, says much of the information out there is confusing and contradictory. Therefore, he echoes Dr. Alloway’s statement that it is absolutely prudent that patients clear the use of CBD with their doctor before giving it a go.

“[The provider] knows the individual and knows what other treatments they may or may not be taking,” Dr. McIntyre explains. “They have a panoramic view of the patient’s medications, and would have [a better idea] of whether the patient is taking another medication that may have an interaction.”


Official Blog of the American Journal of Kidney Diseases

#NephMadness 2020: Mary Jane’s Big Dance – Marijuana is OK (When Used Responsibly and Safely) in Kidney Transplantation

Posted on April 20, 2020 by AJKDblog in NephMadness // 0 Comments

Joshua Rein @ThepHunClub

Joshua Rein is an Instructor of Medicine at the Icahn School of Medicine at Mount Sinai in New York City. His clinical and research interests include the kidney endocannabinoid system and the effects of cannabis and cannabinoids on kidney function.

Competitors for the Transplantation Region

Biomarkers in Rejection vs Biopsy in Rejection
Marijuana is OK vs Marijuana is Not OK in Transplantation

Michael Jordan may have won March Madness in 1982 but in 2020, a different MJ flies high and takes to the court. Marijuana (cannabis) for recreational and medicinal uses has exploded in popularity and social acceptance across the world. This is particularly true for older adults and the elderly , whose usage has increased by 200% over the last 3 years.

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Many patients are already using cannabis, sometimes without our knowledge. More than ever before, we need to be aware of the risks and benefits of cannabis use in our patients . Physicians remain poorly educated with respect to cannabis and the endocannabinoid system . The federal prohibition on cannabis as a Schedule I drug in the US has strongly limited research and has prevented teaching about the drug in medical education.

Lighting it up in the Transplantation Region, Team Marijuana is OK faces off against Team Marijuana is Not OK in a fiery battle to hash out a winner. There are several arguments supporting both teams, so let’s hit it.

First, the distinction needs to be made between recreational cannabis and medical cannabis. Recreational cannabis is most commonly smoked and contains high levels of Δ-9 tetrahydrocannabinol (THC), responsible for the euphoric intoxicating “high” but which can cause anxiety and panic attacks at high doses. Medical cannabis, which generally contains higher concentrations of cannabidiol (CBD), a nonintoxicating cannabinoid, is taken by mouth, avoiding the cardiovascular and pulmonary harms of smoke inhalation. Medical cannabis may achieve symptom relief with subpsychoactive doses of THC, avoiding the acute neuropsychiatric side effects that are of significant concern for transplant adherence.

Cannabis and cannabinoids may have immunomodulatory effects among kidney transplant recipients but the actual effects are currently unknown. Preclinical models demonstrate a protective effect against graft rejection. We do not know enough regarding the pharmacokinetics and pharmacodynamics of cannabinoids in those with renal insufficiency. Additionally, we do not know enough regarding cannabinoid effects on immunosuppressive regimens including concerns of regimen adherence and the unpredictability of drug interactions. Notably, CBD can inhibit p450 liver enzymes and potentially raise tacrolimus and cyclosporine levels.

We should be mindful that the legal cannabinoid market is still fairly young and early in development but expanding rapidly, possibly even too fast, before regulatory agencies are able to develop appropriate guidance, safety evaluation, quality standards, and consumer protections . It is reasonable to be hesitant regarding cannabis use in transplant recipients until we know more about its effects on transplant recipients. However, this will not be possible as long as cannabis remains a Schedule I controlled substance. As health care providers, we want to do what is best for our patients while keeping them safe.

Symptom management for people living with advanced chronic kidney disease (CKD) and end-stage kidney disease (ESKD) is very important for quality of life. Unfortunately, many symptoms remain uncontrolled and inadequately treated. People may seek alternative treatment options, which may include cannabis and cannabinoid-based preparations as access becomes easier.

Cannabis may be efficacious for several symptoms frequently experienced by people with advanced CKD and ESKD, including pain. Last year’s NephMadness featured the Pain Region , with Team Opioids making it to the final four but losing to the eventual champion, US HTN Guidelines. The opioid epidemic has been devastating. It seems like opioids are the only effective treatment option for pain but as described in last year’s post , opioids have their own issues and short-term and chronic use are associated with increased mortality in people with CKD , ESKD , and kidney transplant recipients .

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Despite these adverse effects, 20% of all patients on dialysis take prescription opioids chronically. Access to medical cannabis has been associated with decreased opioid prescriptions and dose reductions . The current opioid epidemic requires approaches to treat pain effectively while decreasing opioid prescriptions in this patient population. Cannabis could have a therapeutic role in pain management that deserves clinical consideration and further clinical trial investigation. Substantial evidence exists for the use of cannabis and cannabinoids to treat chronic pain.

We will see more people undergoing kidney transplant evaluation having used or tried cannabis. Additionally, some of these people will have been certified by a physician to use medical cannabis legitimately. Cannabis use in potential transplant recipients may have implications for pre-transplant screening, such as delayed candidate listing or contributing to ineligibility , with implications for post-transplant outcomes. Denying transplant listing solely on the basis of a positive drug screen deprives/blocks numerous patients, some otherwise young and healthy, of increased quality of life and longevity with kidney transplantation. If cannabis is able to treat pain symptoms adequately, and decrease or eliminate the need for opioids, it is reasonable to allow for continued use post-transplant.

Concerns regarding adverse effects on cognition and memory are valid, although medical cannabis tends to be used at doses lower than what causes these cognitive impairments. In all fairness, opioids are associated with these adverse effects on cognition and memory as well.

Anxiety can occur post-transplant due to concerns of health, finances, or concerns of kidney rejection/failure. Anxiety increases risk of post-transplant readmission. CBD has anti-anxiety effects; pain and anxiety are the top 2 reasons why Americans use it.

Alternatively, little is known regarding the safety of cannabis and long-term clinical outcomes among kidney transplant recipients. A few retrospective single center studies do not show an increased risk of graft dysfunction, acute rejection, or graft loss 1-year post-transplant among recipients who consume cannabis .

However, cannabis dependence or abuse (CDOA) after kidney transplantation appears to have consequences for allograft and patient outcomes . Although post-transplant CDOA is associated with increased graft loss, plenty of people use cannabis responsibly and do not abuse it. There is no denying that substance dependence or abuse of any drug is detrimental to health. We should keep an open mind and allow our patients to be honest and open with their cannabis usage to ensure that dependence or abuse does not develop.

Overall, although strong arguments can be made for both teams, marijuana (cannabis) will only become more popular in the years to come. I predict Team Marijuana is OK smokes past Team Marijuana is Not OK , becomes a chronic winner and blazes to victory, as long as transplant recipients consume it responsibly and safely…paging Dr. Greenthumb.

– Guest Post written by Joshua Rein @ThepHunClub

As with all content on the AJKD Blog, the opinions expressed are those of the author of each post, and are not necessarily shared or endorsed by the AJKD Blog, AJKD, the National Kidney Foundation, Elsevier, or any other entity unless explicitly stated.