Non-invasive Vagus Nerve Stimulation for the Prevention of Migraines

The study is a prospective randomized, multi-center, double-blind, parallel, sham-controlled study, designed for comparison of two parallel groups, gammaCore®-Sapphire (active treatment) and a sham (inactive) treatment. The study period will begin with a four-week run-in period, during which there is no investigational treatment. The purpose of the run-in period will be to establish a baseline of the subject's headache/migraine history for longitudinal comparison. The run-in period will be followed by a 12-week randomized period when the subjects will be randomized (1:1) to either active treatment or sham (inactive) treatment. Subjects will dose themselves 3 times per day for 12 weeks.