Cannabidiol and pharmacokinetics drug-drug interactions: Pharmacological toolbox

The contribution of addictovigilance data to the French medical cannabis experimentation

In France, cannabis is the most widely used illicit psychoactive substance. Recently, a new market for cannabidiol (CBD) products has emerged called "cannabis light" or "cannabis well-being". In parallel, the experimentation of medical cannabis began on March 26, 2021, for specific indications. Some clinical effects of cannabis have been put forward for medical purposes; however, these are counterbalanced by adverse events (AEs). Data from addictovigilance and international literature on the risks associated with non-medical cannabis use have helped establish exclusion criteria for patients at risk of complications when using medical cannabis (such as those with psychotic disorders, severe cardiovascular, renal, or liver conditions). This also enables the early identification of AEs. Cannabis-based medications are composed of cannabidiol (CBD) and/or delta-9-tetrahydrocannabinol (THC) in varying concentrations. We aimed to present the contribution of the addictovigilance data regarding cannabis-related reports to the ongoing French experimentation on cannabis used for medical purposes, to anticipate potential adverse drug reactions in the treated patients. Among the 3164 patients included in the French experimentation, 1186 of them presented at least one AE. Some of the AEs reported in addictovigilance surveys on non-medical cannabis and CBD were observed during the experimentation of medical cannabis such as cardiovascular AEs (myocardial infarction, strokes, transient ischemic attack), psychiatric AEs (suicidal idea and attempt, depression), worsening of epilepsy, cognitive and/or sedative disorders. Given the potential for pharmacodependence of cannabis medications, it seems important for clinicians to gather the addiction history of their patients (past or present), particularly the use of non-medical cannabis (illicit) and non-medical CBD, to prevent and early detect any risk of abuse. The generalization of the use of medical cannabis was adopted and defined in the 2024 Social Security Financing Act. These medications will be accessible to patients by medical prescription for defined indications. Addictovigilance as well as pharmacovigilance monitoring is crucial in this context of continuing to make medical cannabis available in France. Adverse effects of interest will need to be monitored in particular, including neurological disorders (epilepsy exacerbation, cognitive disorders), psychiatric disorders (substance use disorder, suicidal behaviour), and cardiovascular disorders as well as any unexpected AEs. Close addictovigilance monitoring contributes to increasing the awareness of professionals involved in the clinical management of patients treated with medical cannabis.

Cannabidiol (CBD): Confronting consumers' expectations of therapeutic benefits with pharmacological reality

In recent years, the increase in cannabidiol (CBD) sales in Europe has raised questions regarding the legal status of this product, as well as its safety of use. Consumers seem to be looking for solutions to various health issues. However, the scientific reality is much more nuanced. The European CBD market emerged in Switzerland in 2016 and subsequently expanded across the continent. This expansion has been facilitated by the establishment of delta-9-tetrahydrocannabinol (THC) concentration limits for these products. However, the current market offers a diverse range of CBD products, often lacking clear information on raw materials, product concentrations and recommended dosages. Regulating these products is challenging, as the appropriate classification of CBD remains uncertain. CBD products are in high demand worldwide, with many people seeking alternative treatments for medical conditions or general health and well-being benefits. However, the use of CBD products often relies on self-medication and lacks sufficient scientific evidence. Improved communication between patients and healthcare professionals is needed to ensure informed decisions and address potential interactions with other medications. Scientific evidence on CBD is currently limited and the efficacy of CBD-containing products has only been proven in clinical trials for Epidyolex® as an add-on therapy. There is no consensus on the long-term safety, appropriate dosage, schedules or administration routes for CBD. Health claims associated with CBD are not consistent with the available scientific research, which is still in its early stages. Further clinical research is needed to establish the efficacy and safety of CBD in various medical conditions. The enthusiasm surrounding CBD-based products should be tempered by the limited scientific evidence of their efficacy, the inadequacy of patient expectations, regulatory concerns and potential drug interactions.