Medication-overuse headache (MOH) is common, disabling and underrecognized in clinical practice
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 The prevalence of MOH in the general population is 1%–2% and as high as 20.6% in referrals to Canadian headache clinics.2
Recommended monthly maximums for commonly used medications in headache
The headache associated with medication overuse can be different in quality and location from the baseline headache
This can make the diagnosis of the underlying primary headache disorder difficult at initial consultation. Neuroimaging should be reserved for patients with red flags if the clinical history supports MOH (Appendix 1, available at www.cmaj.ca/lookup/suppl/doi:10.1503/cmaj.171101/-/DC1).1 Clinical cues for MOH include an escalation of headache frequency associated with analgesia usage, morning headaches reflecting analgesia withdrawal, predictable development of a headache when medication is delayed and concussion with headache that is not improving.3
Opioid- and butalbital-containing agents should not be used to treat headaches
Use of opioids and barbiturates can lead to central sensitization, headache relapse, hyperalgesia and abuse.3 Medication-overuse headache can develop in the absence of problematic headaches when opioids are used for chronic pain.3
The cornerstone of treatment is patient education followed by stopping or tapering the offending medication
Cessation of offending analgesia may lead to transient exacerbation of headache (lasting 2–10 days) that can be treated with a bridging two-week course of naproxen, long-acting frovatriptan twice per day or short prednisone taper.4 Abrupt withdrawal of overused medications is recommended, except for barbiturates or opioids, which should be tapered over one month.4
A prophylactic medication should be started to reduce primary headache frequency and severity
Topiramate, β-blockers, amitriptyline and gabapentin are strongly recommended for prophylaxis of the primary headache; choice should be individualized based on the drugs’ adverse-effect profiles.5 For difficult cases, particularly with serious behavioural or medical comorbidities, day-hospital or inpatient treatment for intravenous rescue therapy and psychologic support may be required.3
Footnotes
Competing interests: None declared.
This article has been peer reviewed.
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- Medication-overuse headache (MOH) is common, disabling and underrecognized in clinical practice
- The headache associated with medication overuse can be different in quality and location from the baseline headache
- Opioid- and butalbital-containing agents should not be used to treat headaches
- The cornerstone of treatment is patient education followed by stopping or tapering the offending medication
- A prophylactic medication should be started to reduce primary headache frequency and severity
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