Medication Overuse Headache

What it is

A common but underdiagnosed complication of frequent acute medication use. MOH affects an estimated 1–2% of the general population and up to 30–50% of patients at headache specialty clinics. It is treatable with medication withdrawal, often combined with preventive therapy. The Vault flags MOH risk when acute medication use days exceed threshold.

How it works

Chronic daily headache resulting from overuse of acute headache medications. Diagnostic threshold: simple analgesics ≥15 days/month for >3 months; ergotamines, triptans, opioids, or combination analgesics ≥10 days/month for >3 months. CGRP pathway sensitization and central sensitization are both implicated. Paradoxically, the medication used to treat headache becomes a driver of headache frequency.

What patients need to know

Medication overuse headache — sometimes called "rebound headache" — happens when pain relievers or migraine medications are used too often. Over time, the medication that's supposed to help can actually start causing more headaches. It's one of the most common reasons chronic migraine gets harder to control. The treatment is to reduce how often you use acute medications, which can be uncomfortable at first but usually leads to fewer headaches over time. Your provider can help create a plan for this.

Prior authorization

MOH status is clinically significant for PA submissions. Payers may view MOH as evidence of undertreated migraine (supporting medical necessity for preventive therapy) or may raise concerns about patient compliance. When present, document MOH explicitly: which medication, days/month of use, duration. Concurrent MOH does not disqualify a patient from CGRP preventive therapy — in fact, preventive therapy is often the recommended treatment to break the MOH cycle. Frame MOH as a complication of undertreated migraine, not patient behavior.

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