Prevalence of medication overuse headache in an interdisciplinary pain clinic

Table 1 Overview of the different criteria for Medication overuse headache (MOH)

	ICHD-I	ICHD-II	ICHD-II revised	ICHD-II Appendix
	*IHS 1988*	*IHS 2004*	*Silberstein et al* . *2005*	*Olesen et al* . *2006*
Comment	not defined	Different entities for different substances	Elimination of headache characteristics	Elimination of criterion D
A		Headache¹ > 15 days/month	Headache ≥ 15 days/month	Headache ≥ 15 days/month
B		Substance overuse ≥ 10/15² days/month	Substance overuse ≥ 10/15² days/month	Substance overuse ≥ 10/15² days/month
		for ≥ 3 months	for > 3 months	for > 3 months
C		Headache developed or worsened	Headache developed or worsened	Headache developed or worsened
D		Resolution within 2 months after withdrawal	Resolution within 2 months after withdrawal	n.a.

¹ Headache characteristics defined for different substances.
² ≥ 10 days/month for ergotamines, triptans, opioids or combination analgesics; ≥ 15 days/month for simple analgesics (or combination of any, ICHD-II Appendix).

ISSN: 1129-2377