Fig. 2From: Calcitonin gene-related peptide in blood: is it increased in the external jugular vein during migraine and cluster headache? A reviewEffect of subcutaneous sumatriptan 6 mg on CGRP levels (pmol/l) in external jugular vein during migraine attacks (n = 8). Seven of eight patients responded to sumatriptan and in all these cases a decrease in CGRP levels was observed. One patient did not respond and there was no change in CGRP levels in this patient [18]Back to article page