Short answer
No large controlled trial shows that cannabis aborts a migraine attack in progress. The evidence base is survey data and small retrospective chart reviews. In those reports, patients say cannabis cut pain and nausea. That is not proof of abortion. Migraine attacks end on their own. Placebo arms in migraine drug trials show pain relief at 2 hours in about 30% of patients, so a drug has to beat that number with a control group behind it.
What the studies show
Retrospective chart review, 2016
Rhyne and colleagues reviewed records from 121 adults who used medical cannabis for migraine at a Colorado clinic. Mean headache days per month fell from 10.4 to 4.6. The study had no control group, no blinding, and no placebo. It measured prevention over months, not abortion of a single attack.
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Survey data
Self-report surveys of people who use cannabis describe migraine pain relief after inhalation. Reported onset runs from 15 to 30 minutes. These samples are self-selected. People who get no relief do not fill out the survey.
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Trials
Controlled trials of cannabinoids for migraine are small. A trial of nabilone, a synthetic cannabinoid, tested prevention of chronic migraine, not acute abortion. No large randomized trial of inhaled cannabis for acute migraine has been published.
Why abortion is hard to prove
Migraine is a cycling condition. An attack treated at 8 a.m. that ends by 10 a.m. may have ended without treatment. Attack intensity also varies between episodes, so patients compare a treated attack to a memory of past attacks. Only a randomized design with a sham product answers the question.
THC, CBD, and timing
THC binds CB1 receptors in the brain and alters pain signaling. CBD binds CB1 with low affinity. Most published reports of migraine relief involve THC-dominant products. Doses in surveys range from 1 to 2 puffs of inhaled flower up to 10 mg or more of oral THC. Route changes the clock. Inhaled THC peaks in about 10 minutes. Oral THC peaks in 60 to 120 minutes, which is slower than the attack you are trying to stop.
Risks
- Medication overuse headache: case reports link near-daily cannabis use to chronic daily headache.
- Cannabis use disorder: about 1 in 10 adults who use cannabis develop dependence, and the rate is higher with use every day.
- Driving: THC impairs reaction time for 3 to 6 hours after inhalation.
- Cannabinoid hyperemesis: heavy long-term use is linked to cyclic vomiting.
What to do during an attack
Take an acute migraine drug early. Triptans, NSAIDs, and gepants have controlled trial data for stopping an attack. Rest in a dark room. Treat nausea with an antiemetic if needed. Headache guidance from US specialty groups lists no cannabis product as a first-line acute treatment, because the controlled data does not exist.
If you want to test cannabis for migraine, log the attack start time, the product, the dose, the route, and the pain score at 30, 60, and 120 minutes. A record of 10 attacks tells you more than a record of one.
Legal note
Most US states allow medical cannabis. About half allow adult use. Cannabis remains Schedule I under federal law. Licensed shops label THC and CBD content per package, which lets you track dose against effect.