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Cannabinoids may affect activity of other pharmaceuticals - Science Daily

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Cannabinoid-containing products may alter the effects of some prescription drugs, according to Penn State College of Medicine researchers. They published information that could help medical professionals make safe prescribing choices for their patients who use prescription, over-the-counter or illicit cannabinoid products.

Kent Vrana, professor and chair of pharmacology at the College of Medicine, and Paul Kocis, a pharmacist at Penn State Health Milton S. Hershey Medical Center, compiled a list of 57 medications that may not function as intended when used with medical cannabinoids, CBD oil (hemp oil) and medical or recreational marijuana. The list was published in the journal Medical Cannabis and Cannabinoids.

The medications on the list have a narrow therapeutic index, meaning they are prescribed at specific doses -- enough to be effective, but not enough to cause harm. Vrana says it's important for medical professionals to consider the list when prescribing medical cannabinoids and how it may affect other medications a patient is taking.

To develop the list, the researchers looked at the prescribing information for four prescription cannabinoid medications. This information included a list of enzymes in the body that process the active ingredients in those medications, which can include delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). They compared this information against prescribing information from common medications using information available from regulatory agencies like the U.S. Food and Drug Administration to identify where there may be overlap, called a drug-drug interaction.

The list contains a variety of drugs from heart medications to antibiotics and antifungals. As one example, researchers identified warfarin, a common anticoagulant that prevents harmful blood clots from forming, as having a potential drug-drug interaction with cannabinoid products. Often prescribed for patients with atrial fibrillation or following cardiac valve replacement, the drug has a narrow therapeutic index, and Vrana cautions that medical professionals consider this potential drug-drug interaction both when prescribing warfarin to patients on prescription cannabinoids or prescribing cannabinoids to a patient taking warfarin.

The researchers say that medical professionals should also consider patient use of CBD oil products and medical and recreational marijuana when using or prescribing drugs on the identified list. Most of those products lack government regulation and there is little to no prescribing or drug-drug interaction information for those products.

"Unregulated products often contain the same active ingredients as medical cannabinoids, though they may be present in different concentrations," Vrana said. "The drug-drug interaction information from medical cannabinoids may be useful as medical professionals consider the potential impact of over-the-counter or illicit cannabinoid products."

Vrana advises that patients be honest with their health care providers about their use of cannabinoid products -- from over-the-counter products to recreational marijuana. He says that doing so can help ensure the safe and effective use of prescribed medications.

In addition to the identified list of 57 prescription medications with a narrow therapeutic index that is potentially impacted by concomitant cannabinoid use, a comprehensive list of 139 medications that could have a potential drug-drug interaction with a cannabinoid is available online. Vrana and Kocis plan to routinely update this drug-drug interaction list as newer medications are approved and real-world evidence accumulates.

Kent Vrana received a sponsored research agreement from PA Options for Wellness, a medical cannabis provider and clinical registrant in Pennsylvania, and this research was supported in part by the agreement. The College of Medicine and PA Options for Wellness have a 10-year research agreement designed to help physicians and patients make better informed clinical decisions related to cannabinoids.

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Materials provided by Penn State. Note: Content may be edited for style and length.

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