Bottom line
Evidence for cannabis and migraine is limited. Small studies show inhaled or oral cannabis may cut migraine frequency. No large randomized trial confirms this. CBD alone has no clinical trial data for migraine. The FDA has not approved any cannabis product for migraine.
cannabis for managing migraines
What the research shows
A 2016 study in Pharmacotherapy tracked 121 adults with migraine. Monthly migraine days fell from 10.4 to 4.6 after cannabis use. Pain severity did not change. The study was observational.
cannabis for treating migraines
A 2020 review in the Journal of Clinical Neuroscience found 12 studies. Most were retrospective. Results were mixed. Some patients reported fewer migraines. Others reported no change.
Cannabis for Managing Migraines: What the Evidence Shows
A 2019 survey of 2,000 migraine patients found 30% tried cannabis. Half of those reported relief. Surveys do not prove cause.
THC versus CBD
THC binds CB1 receptors in the brain. It can alter pain signaling. CBD does not bind CB1. CBD may reduce inflammation in animal models. No human trial has tested CBD for migraine.
Products with THC may help acute attacks. Products with only CBD have less evidence.
Forms and timing
- Inhaled: effects start in 1 to 5 minutes. Peak at 15 to 30 minutes.
- Oral: effects start in 30 to 90 minutes. Peak at 2 to 4 hours.
- Study doses ranged from 1 mg to 10 mg THC per dose. No standard dose exists.
Risks
- THC: anxiety, paranoia, impaired memory, fast heart rate.
- Dependence: about 9% of adult cannabis users.
- Cannabis hyperemesis syndrome: severe vomiting with long-term use.
- CBD: liver injury at high doses (above 20 mg/kg per day).
- Drug interactions: CBD blocks CYP3A4 and CYP2C19 enzymes.
- Do not use during pregnancy or adolescence.
Questions for a doctor
- Does my migraine history suggest a treatable trigger?
- Can cannabis interact with my current prescriptions?
- What is the risk of dependence for my profile?
- Are there approved preventive drugs I have not tried?