Triptan overuse in the Dutch general population: a nationwide pharmaco-epidemiology database analysis in 6.7 million people.

Introduction: A population-based observational study was used to assess the prevalence, demographics, risk factors, and costs of triptan overuse, defined as more than 30 (International Headache Society criteria) or 54 (stringent criteria) defined daily doses per 3 months.
Methods: Analysis of the Dutch Health Care Insurance Board Database for 2005, which included prescriptions for 6.7 million people (46% of the total Dutch population).
Results: Triptans were used by 85,172 (1.3%) people; of these, 8,844 (10.4%; 95% CI 10.2-10.6) were overusers by International Headache Society and 2,787 (3.3%; 95% CI 3.2-3.4) were overusers by stringent criteria. The triptan-specific odds ratios for the rate of International Headache Society overuse compared with sumatriptan were: 0.26 (95% CI 0.19-0.36) for frovatriptan; 0.34 (95% CI 0.32-0.37) for rizatriptan; 0.76 95% CI 0.68-0.85) for naratriptan; 0.86 (95% CI 0.72-1.02) for eletriptan; 0.97 (95% CI 0.88-1.06) for zolmitriptan; and 1.49 (95% CI 1.31-1.72) for almotriptan. Costs for overuse were 29.7 million euros; for the International Headache Society criteria this was 46% of total costs and for stringent criteria it was 23%.
Discussion: In the Dutch general population, 1.3% used a triptan in 2005, of which 10.3% were overusers and accounted for half of the total costs of triptans. Users of frovatriptan, rizatriptan and naratriptan had a lower level of overuse.