Cannabis for Anxiety: Evidence, Doses, Risks

Short answer

Cannabis is not a treatment for anxiety. THC, the compound that causes the high, can cause anxiety and panic. CBD has shown some effect in small trials, but results are mixed. The FDA has approved no cannabis product for anxiety.

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What THC does

THC binds CB1 receptors in the brain and changes how the amygdala reads threat. The result depends on dose.

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• Low dose: some users report calm. Many report nothing.
• High dose: racing heart, paranoia, panic attack.

NIDA lists anxiety and paranoia among the short-term effects of high THC doses. THC content in seized cannabis flower rose from under 4% in 1995 to about 14% in 2019. A joint from 1995 is not the same product as a joint from today.

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What CBD does

CBD does not cause a high. It acts on serotonin 5-HT1A receptors and on other targets. The human data come from small trials.

1. 2011: 24 people with social anxiety disorder took 400 mg CBD before a public speaking test. The CBD group reported less anxiety than the placebo group.
2. Later trials used 150 mg to 600 mg per day for 4 to 12 weeks. Results did not repeat.
3. Most trials enrolled under 100 people. Dose, product, and delivery method differ between studies.

NCCIH states that evidence for CBD in anxiety is limited and that larger trials are needed.

Dose and product notes

• Smoked or vaped THC reaches the brain in seconds to minutes. Edibles take 30 to 120 minutes.
• Tincture and capsule effects peak between 1 and 3 hours.
• Labels are not reliable. A 2017 study of 84 CBD products found 26% held less CBD than listed and 21% contained THC.

FDA status

The FDA approved one CBD drug, Epidiolex, in 2018 for seizures in Lennox-Gastaut syndrome and Dravet syndrome. That approval does not cover anxiety. FDA warnings for CBD include liver injury, drowsiness, and interactions with other drugs.

Risks

• Cannabis use disorder: NIDA reports about 3 in 10 people who use cannabis develop it.
• Heart: cannabis raises heart rate. CDC links use to higher heart attack risk.
• Withdrawal: anxiety, irritability, and sleep problems peak in the first week after stopping.
• Psychosis: risk rises with high-THC products and frequent use, most in people with a personal or family history.
• Age: sales require age 21 and up in states with adult use. Use under 18 carries higher risk to a developing brain.

If you plan to try it

1. Buy a product with a lab test and a listed THC and CBD percentage.
2. Start at 1 mg to 2.5 mg THC, or skip THC and start with CBD.
3. Wait 2 hours before taking more, in particular with edibles.
4. Do not mix with alcohol or benzodiazepines.
5. Stop if panic starts. A quiet room and water help.

Options with more data

Cognitive behavioral therapy, SSRIs, SNRIs, and aerobic exercise have trial data for anxiety disorders. Talk to a clinician. Anxiety responds to treatment, and cannabis is not a first-line option.