Dec 27, 2018 Noninvasive Vagus Nerve Stimulation Effective for Episodic Migraines Noninvasive Vagus Nerve Stimulation Effective for Episodic Migraines... complete pain relief in as little as 30 minutes and for as long as 120 minutes after onset of attack, according to study results published in Neurology. ... read morePublished on 2018-12-27