IRCT20140624018213N2 IRCT 2026-06-17 Tehran University of Medical Sciences Investigation of the Effect of Transcranial Direct Current Stimulation on Headache in Patients with Chronic Migraine Efficacy of prefrontal-occipital transcranial direct current stimulation for refractory chronic migraine 2023-05-22 anticipated 30 Complete https://irct.ir/trial/90031 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment. 2 Chronic Migraine. tDCS is administered by a trained operator at 2 mA. Electrodes are placed according to the 10–20 EEG system, with the cathode at Oz and the anode at the right DLPFC (F4). Each session lasts 20 minutes and is performed at a similar time of day. Treatment includes three consecutive sessions in week 1, three in week 2, followed by weekly sessions until session 12.. No - There is not a plan to make this available Justification or reason for not sharing IPD is Patients’ data will be kept confidential by the corresponding author and, upon request of the journal editor, may be temporarily and selectively shared with the editor solely for verification of the findings.