Short answer
Studies do not support cannabis as a treatment for depression. No large randomized trial shows a cannabis product relieves major depression. Regular use is linked to higher risk of depression. The FDA has not approved cannabis or CBD for depression.
Cannabis as a Depression Treatment: Reviews and Comparison
What the research shows
Observational studies
Large cohort studies find an association between cannabis use disorder and depression. A 2023 study in JAMA Psychiatry tracked more than 6 million people. It found cannabis use disorder linked to a higher risk of depression. These studies cannot prove cannabis causes depression. They also cannot prove depression causes cannabis use.
Randomized trials
Randomized controlled trials of cannabis for depression are small and few. A 2021 trial tested CBD 300 mg per day in 37 people with anxiety and depression. Symptoms dropped over 8 weeks. The trial had no placebo group. Reviews in The Lancet Psychiatry describe the evidence as limited.
CBD vs THC
CBD and THC have different effects. Most depression studies use CBD. THC may worsen anxiety and mood in some people. High-THC products are common in dispensaries. Those products are not the same as the CBD used in trials.
cannabis vs ssri for depression
Limits of the evidence
- Most studies observe people over time. They do not assign cannabis by chance.
- Products vary in THC, CBD, and other compounds.
- Depression has many forms. A single treatment is unlikely to work for all.
- Self-reported use is often inaccurate.
Bottom line
Cannabis is not a proven depression treatment. Some people report relief, but that is not evidence of effectiveness. Standard treatments include therapy and FDA-approved drugs. People with depression should talk to a clinician. Do not stop prescribed treatment to use cannabis.