A comprehensive pharmacology review finds that cannabis's therapeutic potential extends far beyond THC and CBD, with terpenes, flavonoids, and other plant compounds contributing meaningful pharmacological activity and synergistic interactions.
Readers who want a deeper understanding of how the many compounds in cannabis work together.
Over 100 phytocannabinoids plus dozens of terpenoids contribute to cannabis pharmacology
What the researchers found
This major review, authored by leading cannabis researchers, argued that the pharmacology of cannabis cannot be reduced to THC and CBD alone. The review covered several key areas:
Terpenoids (aromatic compounds like myrcene, limonene, pinene, linalool, and beta-caryophyllene) contribute pharmacological effects at concentrations found in cannabis, including anti-inflammatory, analgesic, anxiolytic, and anti-cancer properties. Their synergistic relationships with cannabinoids form the "entourage effect."
Lesser-known cannabinoids including CBG, CBC, CBN, THCV, and CBDV each have distinct pharmacological profiles. CBD itself showed "remarkably versatile pharmacology" across pain, anxiety, psychosis, inflammation, and seizure disorders.
Other plant parts yield unique compounds: friedelin from roots, canniprene from leaves, cannabisin from seed coats, and cannflavin A from sprouts, each with independent pharmacological interest.
Why it matters
This review reframes cannabis from a "THC delivery system" to a complex pharmacological plant with dozens of active compounds working in concert. Understanding these interactions is essential for developing better cannabis-based medicines and for explaining why different cannabis strains or preparations produce different effects despite similar THC/CBD ratios.
The numbers in context
Over 100 individual phytocannabinoids identified. Cannabis golden age of pharmacology began in the 1960s with Mechoulam's isolation of CBD and THC. Review covers terpenoids, flavonoids, and compounds from roots, leaves, seed coats, and sprouts.
How the study worked
Comprehensive narrative review covering the pharmacology of phytocannabinoids, terpenoids, flavonoids, and other cannabis-derived compounds. Authored by Ethan Russo and Jahan Marcu, prominent researchers in cannabis pharmacology.
What this study cannot tell us
Narrative review that synthesizes a vast literature without systematic methodology. Some of the claimed synergies are based on theoretical pharmacological reasoning rather than rigorous clinical evidence. The authors are prominent advocates for whole-plant cannabis medicine, which may influence emphasis. Many of the lesser-known compounds have limited preclinical data.
How to read the evidence
Strong evidence: comprehensive review by leading researchers synthesizing decades of pharmacological research.
When this study was published
Published in 2017. A landmark review in cannabis pharmacology by Russo and Marcu.
The bigger picture
The concept of the entourage effect, where the full spectrum of cannabis compounds works together to produce effects that isolated compounds cannot replicate, has important implications for the pharmaceutical development of cannabis medicines. It raises the question of whether single-compound drugs (like pure CBD) capture the full therapeutic potential of the plant.
Questions still open
- Can the entourage effect be rigorously demonstrated in controlled clinical trials? Are specific terpene-cannabinoid combinations more effective for particular conditions? Will regulatory frameworks adapt to accommodate multi-compound cannabis preparations?
Common questions
What is the entourage effect?
Do terpenes in cannabis actually do anything?
Read the original research
Cannabis Pharmacology: The Usual Suspects and a Few Promising Leads.
Advances in pharmacology (San Diego, Calif.), 80, 67-134
Citation
Russo, Ethan B; Marcu, Jahan. (2017). Cannabis Pharmacology: The Usual Suspects and a Few Promising Leads.. Advances in pharmacology (San Diego, Calif.), 80, 67-134. https://doi.org/10.1016/bs.apha.2017.03.004
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