Cannabidiol-drug interaction in cancer patients: A retrospective study in a real-life setting.

Cannabidiol (CBD) consumption in cancer patients is growing and there is a need to investigate how to detect cannabidiol-drug interactions (CDIs). However, CDIs and the clinical relevance between CBD, anticancer treatment, supportive care and conventional drugs is poorly studied especially in real-life settings. In 1 oncology day-hospital, a cross-sectional study in 363 cancer patients treated with chemotherapy revealed 20 patients (5.5%) who consumed CBD. In this study we aimed to explore the prevalence and clinical relevance of CDIs among these 20 patients. CDI detection used the Food and Drug Administration Drugs.com database and clinical relevance was assessed accordingly. Ninety CDIs with 34 medicines were detected (4.6 CDI/patient). The main clinical risks were central nervous system depression and hepatoxicity. The main CDIs were assessed as moderate and anticancer treatment do not seem to add to the risk. CBD discontinuation appears to be the most consistent management. Future studies should explore the clinical relevance of drug interactions with CBD in cancer patients.