Medication Overuse and Headache Burden: Results From the CaMEO Study

Area of Science:

• Neurology
• Epidemiology
• Pharmacology

Background:

• Migraine is a prevalent neurological disorder associated with significant disability.
• Acute medication overuse (AMO) is a concern in migraine management, potentially leading to medication overuse headache (MOH).
• Understanding the prevalence and characteristics of AMO is crucial for effective migraine treatment strategies.

Purpose of the Study:

• To determine the frequency of AMO in episodic and chronic migraine populations.
• To identify the specific acute medications most commonly overused for migraine relief.
• To pinpoint factors associated with an increased risk of developing AMO.

Main Methods:

• Analysis of data from the Chronic Migraine Epidemiology and Outcomes (CaMEO) Study, a large-scale US population-based internet study.
• Evaluation of medication use patterns, headache frequency, disability, and healthcare utilization among individuals meeting International Classification of Headache Disorders (ICHD-3) criteria for migraine.
• Application of multivariable logistic regression to identify predictors of AMO, with AMO defined by ICHD-3 criteria for MOH but without the 15 monthly headache days requirement.

Main Results:

• 17.7% of 16,789 migraine respondents met the criteria for AMO.
• The majority of AMO cases (67.9%) occurred in individuals with fewer than 15 monthly headache days.
• Simple analgesics, combination analgesics, and opioids were the most frequently overused medication classes.
• Factors associated with AMO included higher monthly headache days, moderate to severe disability, significant interictal burden, use of preventive medications, and recent emergency/urgent care visits for headache.

Conclusions:

• A substantial proportion of individuals experiencing AMO do not meet the diagnostic criteria for medication overuse headache, highlighting a gap in current diagnostic thresholds.
• Patients with AMO exhibit a higher overall disease burden and increased utilization of emergency and urgent care services compared to those with migraine but without AMO.
• These findings underscore the importance of recognizing and addressing AMO even in the absence of established MOH criteria to mitigate disease burden and healthcare costs.