CBD Up to 1200mg Daily Failed to Beat Placebo for Alcohol Addiction or PTSD
Two randomized trials found CBD up to 1200mg/day was well-tolerated in actively drinking individuals but showed no superiority over placebo for reducing alcohol consumption, craving, or PTSD symptoms.
Quick Facts
What This Study Found
Neither trial demonstrated CBD superiority over placebo for drinking outcomes (both groups improved dramatically, Cohen's d>0.9), craving, mood, anxiety, or PTSD symptoms, despite achieving measurable blood levels and acceptable tolerability.
Key Numbers
Study 1: n=27, CBD 600→1200mg/day; Study 2: n=30, CBD 600mg/day; mean trough CBD: 31.15 ng/mL; 22.6% had dose-limiting side effects; both groups improved (Cohen's d>0.9) but CBD≠placebo.
How They Did This
Two simultaneous proof-of-concept RCTs: Study 1 (n=27, AUD only, CBD 600-1200mg/day for 8 weeks) and Study 2 (n=30, AUD+PTSD, CBD 600mg/day for 6 weeks), with pharmacokinetic, safety, and efficacy assessments.
Why This Research Matters
CBD is widely promoted for anxiety, PTSD, and addiction despite limited clinical evidence — these null results from well-designed trials temper expectations and suggest higher doses or different formulations may be needed.
The Bigger Picture
The strong placebo response in both trials highlights a fundamental challenge in addiction research — and suggests that the therapeutic context (regular visits, monitoring) may be as important as the pharmacological intervention.
What This Study Doesn't Tell Us
Small sample sizes (27 and 30); proof-of-concept design not powered for definitive efficacy; achieved CBD blood levels may be insufficient; oral CBD has poor bioavailability.
Questions This Raises
- ?Would higher CBD doses or better bioavailability formulations show efficacy?
- ?Is the placebo response in addiction trials an intervention effect in itself?
Trust & Context
- Key Stat:
- Evidence Grade:
- Two randomized placebo-controlled trials with PK data, but small samples and proof-of-concept design mean negative results should be interpreted cautiously.
- Study Age:
- Published in 2026, providing important negative evidence in a field dominated by positive case reports and preclinical studies.
- Original Title:
- Effects of cannabidiol in alcohol use disorder patients with and without co-occurring post-traumatic stress disorder: Tolerability but no evidence for efficacy in two randomized proof-of-concept trials.
- Published In:
- Alcohol, clinical & experimental research, 50(1), e70212 (2026)
- Authors:
- Bogenschutz, Michael P(2), Blessing, Esther, Dgheim, Danielle, Cho, Dayeon, Zhang, Jun, Laska, Eugene M, Marmar, Charles R
- Database ID:
- RTHC-08128
Evidence Hierarchy
Frequently Asked Questions
Can CBD help with alcohol addiction?
These two clinical trials found CBD up to 1200mg/day did not reduce drinking more than placebo, though both groups improved substantially. Larger trials with higher doses are needed.
Did CBD help with PTSD symptoms?
No — in the trial of AUD patients with co-occurring PTSD, CBD 600mg/day showed no superiority over placebo for PTSD symptoms, craving, or drinking outcomes.
Read More on RethinkTHC
- CBD-oil-quality-guide
- anxiety-medication-after-quitting-weed
- cannabis-chemotherapy-nausea
- cannabis-chronic-pain-research
- cannabis-epilepsy-CBD-Epidiolex
- cbd-anxiety-research-evidence
- cbd-for-weed-withdrawal
- cbd-vs-thc-difference
- medical-benefits-of-cannabis
- quitting-weed-before-surgery
- quitting-weed-medication-interactions
- quitting-weed-pregnancy
- quitting-weed-pregnant
- seniors-older-adults-cannabis-risks-medications
- weed-breastfeeding-THC-breast-milk
- how-much-money-spent-on-weed-calculator
- thc-drinks-vs-edibles-body-processes
- homemade-vs-store-bought-edibles-safety
- how-to-store-edibles-shelf-life-potency
- cannabis-dosing-guide-how-much-thc
- what-is-tincture-different-from-edible
- sublingual-vs-oral-vs-inhaled-thc-absorption
- why-does-weed-hit-different-sometimes
- thc-clearance-calculator-when-weed-leave-system
- thc-detox-calculator-how-long-to-get-clean
- cannabis-cost-calculator-how-much-spending
- cannabis-cost-calculator-what-youre-really-spending
Cite This Study
https://rethinkthc.com/research/RTHC-08128APA
Bogenschutz, Michael P; Blessing, Esther; Dgheim, Danielle; Cho, Dayeon; Zhang, Jun; Laska, Eugene M; Marmar, Charles R. (2026). Effects of cannabidiol in alcohol use disorder patients with and without co-occurring post-traumatic stress disorder: Tolerability but no evidence for efficacy in two randomized proof-of-concept trials.. Alcohol, clinical & experimental research, 50(1), e70212. https://doi.org/10.1111/acer.70212
MLA
Bogenschutz, Michael P, et al. "Effects of cannabidiol in alcohol use disorder patients with and without co-occurring post-traumatic stress disorder: Tolerability but no evidence for efficacy in two randomized proof-of-concept trials.." Alcohol, 2026. https://doi.org/10.1111/acer.70212
RethinkTHC
RethinkTHC Research Database. "Effects of cannabidiol in alcohol use disorder patients with..." RTHC-08128. Retrieved from https://rethinkthc.com/research/bogenschutz-2026-effects-of-cannabidiol-in
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.