For preventative:
https://www.ncbi.nlm.nih.gov/pmc/art...rticle_720.pdf
Unveiling the relative efficacy, safety and tolerability of prophylactic medications for migraine: pairwise and network-meta
analysis - in press
If you're looking for treatment of headache attack, the simple 6 minute finger pressure can stop about 3/4 of them:
Finger pressure can relieve many migraine headaches | Pain Medical Musing