Comparative Real-World Outcomes of OnabotulinumtoxinA and CGRP Monoclonal Antibodies in Chronic Migraine

Background: OnabotulinumtoxinA and calcitonin gene-related peptide (CGRP) monoclonal antibodies are widely used for chronic migraine prevention, but comparative real-world evidence on healthcare utilization remains limited. This study aimed to compare the association of onabotulinumtoxinA versus CGRP monoclonal antibodies with acute triptan prescription and migraine-related return visits in patients with chronic migraine. Methods: We conducted a retrospective cohort study using the TriNetX global federated electronic health record database from 2018 to 2024. Adults with chronic migraine who initiated onabotulinumtoxinA or a CGRP monoclonal antibody were matched 1:1 by propensity score. The primary outcomes were time to acute triptan prescription and time to first migraine-related return visit during follow-up. Results: After propensity score matching, 10,140 patients were included in each treatment group. OnabotulinumtoxinA was associated with a lower hazard of acute triptan prescription than CGRP monoclonal antibodies (hazard ratio 0.513, 95% confidence interval 0.481-0.546; p < 0.001), whereas migraine-related return visits were similar between groups (hazard ratio 1.008, 95% confidence interval 0.977-1.039; p = 0.69). Conclusions: In this multicenter real-world analysis, onabotulinumtoxinA was associated with a lower hazard of acute triptan prescription than CGRP monoclonal antibodies, while migraine-related return visits were comparable. These findings reflect treatment-related healthcare utilization patterns in routine practice and should be interpreted considering the limitations of retrospective electronic health record data.