Abstract::Although Cannabidiol (CBD) has recently been approved for use in some neurological
diseases, the pharmacology of CBD is not fully understood. Experimental reports suggest CBD inhibits
a large number of enzymes, generating the possibility of multiple interactions. The aim is to
describe the main known interactions, evidence, and actual risk in clinical practice. Existing indexed
publications and product monographs were reviewed. The authors cataloged and classified the information
based on the severity of the interaction, type (Pharmacokinetic vs. Pharmacodynamic), and
level of evidence.
1,289 drug-drug interactions were identified (634 pharmacokinetic and 655 pharmacodynamic interactions).
There were a total of 19 major interactions (colchicine, levomethadyl acetate, Mipomersen,
propoxyphene, brexanolone, buprenorphine, esketamine, fezolinetant, ketamine, leflunomide,
levoketoconazole, lomitapide, morphine, pexidartinib, pralsetinib, relugolix, sodium oxybate, teriflunomide,
venetoclax), 393 moderate interactions, 49 minor interactions, and 828 of unknown significance.
Drugs that should be avoided in the presence of cannabidiol, those that should be monitored,
and those interactions that, while frequently mentioned, do not present sufficient evidence to
recommend therapeutic changes are identified. The information highlights the need for caution.
While many interactions have been postulated, only a small group warrants consideration in clinical
practice. For the remaining drugs, special caution is needed. The long history of human use of the
cannabis plant is often confused with the limited timeframe for scientific study of its isolated derivatives.
The available information allows us to identify drugs with potential Drug-Drug Interactions of
varying severity. This information can be used to improve treatment safety.