Do antithrombotic drugs have a role in migraine prevention? A systematic review.

To explore the available evidence on the role of antithrombotics as migraine preventive medication. In clinical practice, the use of antithrombotic drugs in individuals with migraine is sometimes considered, especially in the case of frequent auras, association with patent foramen ovale, or prothrombotic states. This paper systematically reviews evidence on antithrombotic agents' efficacy for migraine prevention. We performed a systematic literature search on PubMed and Scopus including observational and interventional studies focused on antiplatelets or anticoagulants as preventive treatments for migraine. The search included studies published until June 30th, 2024. Ongoing trials on Clinicaltrials.org were also explored. Quality assessment used the Cochrane Risk of Bias 2 (RoB-2) tool for randomized controlled trials (RCTs) and the Risk Of Bias In Non-randomized Studies of Interventions (ROBINS-I) for observational studies. The protocol was registered in the International Prospective Register of Systematic Reviews (PROSPERO identifier CRD42024501531). Out of 1854 records, we found 12 RCTs and 8 observational studies investigating the impact of antithrombotic drugs in migraine prevention. Due to heterogeneity of data, a meta-analysis was not feasible. RCTs tested acetylsalicylic acid (ASA) alone (seven), ASA in combination with other preventive treatments (two), clopidogrel (one), dual antiplatelet treatment (one), and vitamin K antagonists (one). Observational studies tested ASA (three), vitamin K antagonists (three), and clopidogrel (two). No clear evidence of efficacy was found for the overall population of individuals with migraine. Limited evidence from old RCTs-not specifically addressing the role of antithrombotic drugs for migraine prevention-and observational studies showed a potential improvement of migraine with the use of antiplatelet agents, mostly ASA, in special populations, including males, individuals with migraine with aura, and those with patent foramen ovale. Evidence supporting the effectiveness of antithrombotic drugs as a preventive treatment for patients with migraine is insufficient. As preliminary data show potential improvements in special populations in whom those agents act indirectly by ameliorating vascular function, RCTs are worth conducting.