
Patients with primary headache disorders who overuse analgesia are at risk for MOH, in which the analgesia leads to the paradoxical effect of increasing headache frequency ([Box 1][1]).[1][2] The prevalence of MOH in the general population is 1%–2% and as high as 20.6% in referrals to Canadian
Headache, Headache Disorders, Secondary, Humans, Analgesia
Headache, Headache Disorders, Secondary, Humans, Analgesia
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