In a 109-patient RCT, CBD did not meet primary cardiac endpoints in acute myocarditis, but significantly reduced left ventricular mass and showed an anti-inflammatory trend.
Cardiologists; myocarditis researchers; CBD developers.
Significant LV mass reduction (-9.2g, p=0.012) but primary endpoints missed
What the researchers found
CBD (up to 10 mg/kg BID for 12 weeks) did not significantly improve ECV (p=0.054) or GLS (p=0.90). LV mass was significantly reduced (-9.2g, p=0.012). LAESV decreased (-8.1 ml, p=0.038). 100% completion rate.
Why it matters
First RCT of CBD in cardiac inflammation. While primary endpoints were missed, secondary findings suggest anti-inflammatory cardiac effects worth investigating.
The numbers in context
109 patients, 100% completion. ECV: -3.7 ml (p=0.054). LV mass: -9.2g (p=0.012). LAESV: -8.1 ml (p=0.038). GLS: -0.1 (p=0.90).
How the study worked
ARCHER Study: multicenter double-blind placebo-controlled phase 2 trial. 109 patients with CMR-confirmed acute myocarditis. 56 CBD, 53 placebo for 12 weeks.
What this study cannot tell us
Primary endpoints not met. Mild-moderate myocarditis with preserved LV function at baseline. Small sample. Phase 2.
How to read the evidence
Well-designed international RCT with 100% completion, but primary endpoints not met.
When this study was published
2026 study
The bigger picture
The near-significant ECV and significant LV mass reduction provide biological plausibility for CBD's cardiac anti-inflammatory effects.
Questions still open
- Would a larger trial reach ECV significance? Would CBD help more in severe myocarditis? Could it prevent progression to cardiomyopathy?
Common questions
Did CBD help with myocarditis?
Is this the first heart CBD trial?
Read the original research
Impact of cannabidiol on myocardial recovery in patients with acute myocarditis: primary results of the ARCHER study.
ESC heart failure, 13(1)
Citation
McNamara, Dennis M; Cooper, Leslie T; Friedrich, Matthias G; Arbel, Yaron; Bhimaraj, Arvind; Bocchi, Edimar; Hamer, Andrew; Herdy, Artur Haddad; Kerneis, Mathieu; Liu, Peter P; Parker, Andrea B; Pocock, Stuart J; Smith, Eldon R; Tang, W H Wilson; Torre-Amione, Guillermo; Tschöpe, Carsten. (2026). Impact of cannabidiol on myocardial recovery in patients with acute myocarditis: primary results of the ARCHER study.. ESC heart failure, 13(1). https://doi.org/10.1093/eschf/xvaf034
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