AUSTIN, TEX. – Self-treatment of migraines using cannabis can be effective but comes at risk of significant side effects, according to results from a randomized, controlled trial of cannabis products in migraine. The study also suggests that typical recreational doses may be higher than needed, and that products with a mixture of THC and CBD might limit adverse effects, according to lead author Nathaniel Schuster, MD.
“Patients are using cannabis on their own, treating themselves without us having known whether this is effective in a placebo-controlled study. Knowing that there’s a lot of interest in THC and CBD, [it would be useful to know] whether one or both might be effective, as well as a mix,” said Dr. Schuster in an interview. He presented the results at the annual meeting of the American Headache Society.
Dr. Schuster and colleagues tested a cannabis product with 6% THC based on prior studies showing efficacy of that concentration for other pain conditions, according to Dr. Schuster, who is an associate professor and associate clinical director at the University of California, San Diego, center for pain medicine. He added that the study is the first randomized, controlled trial of cannabis in migraine patients that he is aware of. “It’s just hard to do this research. It’s very regulated. We had to go through a lot of government approvals to do this,” he said.
The study produced a key message. “I think one of the really important things for patients to take from this is that recreational doses are probably not necessary. The doses that we studied are lower than people use recreationally. Patients who are self-treating on their own right now are probably using higher doses than they need for the purpose of treating migraine,” said Dr. Schuster.
He also pointed out that the results offer potential insight into reducing side effects. “If [patients] are using THC only, they can hopefully have less of the side effects and tolerate it better by using a THC-CBD mix,” said Dr. Schuster.
Four therapies tested
Participants in the study could self-treat up to four migraine attacks. They were instructed to treat each migraine with one of four therapies, which were provided in a randomized, double-blind order: These included a 6% THC formulation; a mix of THC (6%) and CBD (11%); a CBD 11% formulation; and placebo cannabis with THC and CBD removed by alcohol extraction. Participants filled out a questionnaire 2 hours after treatment, and were then allowed to use rescue treatments if needed, but not additional cannabis. The age range was from 21 to 65, and inclusion criteria included 2-23 migraine days per month. Exclusion criteria included a positive urine test for THC, barbiturates, opioids, oxycodone, or methadone prior to enrollment.
The study included 73 patients who treated a migraine during the study period. There were 247 migraine attacks treated. Among participants, the median age was 41, 82.6% were female and 17.4% were male, and the median body mass index was 26.0 kg/m 2. Participants experienced a median of 15 headache days per month and 6 migraine days per month, and 27.2% had chronic migraine.