Abstract
Sir, We thank Dr Gupta for his interest in our work and we will try to answer to his different remarks. He states that only very few migraine patients regularly using analgesics develop medication overuse headache (MOH). There are several prospective studies dedicated to this topic. In a patient population consulting a specialized headache centre, 64 (14%) out of 450 patients developed chronic headache over 1 year; the most prominent risk factors were medication overuse and headache frequency (Katsarava et al ., 2004). In population-based studies, chronic headaches (at least 15 days/month) have a prevalence of 3–5%, among which 60–80% are attributed to acute medication overuse. In Norway, 11% of the population uses analgesics daily or weekly, and daily …
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