Chronic Migraine Prophylaxis: Ultrasound-Guided Greater Occipital Nerve Block Versus Medical Treatment

"Patients will receive Greater Occipital Nerve Block (GONB) either with local anesthetic (bupivacaine 0.5% 1.5 mL) or with onabotulinum toxin A injection.~Ultrasound-guided GONB will be performed to more accurately locate the nerve through searching for the occipital artery in the medial one-third of the superior nuchal line between the occipital tubercle and mastoid process and injection will be done medial to the artery"

Patients who will receive medical treatment

bupivacaine 0.5% 1.5 mL) or with onabotulinum toxin A injection.