In another win for marijuana research, a study has found that the active compounds in cannabis are more effective at reducing the frequency of acute migraine pain than prescription migraine meds, and with fewer side effects.

The study included a total of 127 participants who suffered from chronic migraines and cluster headaches, severe headaches that occur on one side of the head, often around an eye. Migraine pain usually effects both sides of the head and is often accompanied by light sensitivity and nausea.

The cannabis-based medication the researchers gave the participants was a combination of the two active compounds in marijuana: tetrahydrocannabinol (THC) and cannabidiol (CBD). THC is the psychoactive compound that gets pot users high; CBD doesn’t get you high, but research has shown that it provides therapeutic benefits, including relieving seizures in epileptic patients.

The study had two phases. In the first, sufferers of chronic, acute migraines were given varying doses of the THC-CBD drug. The results showed that those who received a 200mg dose each day for three months experienced significantly less pain–about 55% less (lower doses didn’t provide the same pain relief). [Read more at Forbes]