When the painkillers stop working

You did what anyone would do. The headache came, you took something for it and it helped. Then it helped a little less. Now you are reaching for something most weeks, the good days have thinned out and a low grumbling ache has become the background hum of your life. If that sounds familiar, this is worth reading, and it is not a telling-off.

What medication overuse headache actually is

Medication overuse headache, sometimes called rebound headache, develops in people who already have a headache disorder such as migraine when acute painkillers are taken regularly over a long stretch. The medicine that was treating the pain starts contributing to it.

It has a recognisable shape. Instead of clear attacks with clear gaps between them, a dull constant headache settles in on most days or part of every day, with migraine attacks arriving on top of that background. The Migraine Trust describes it exactly this way. Painkillers also tend to blunt how well preventive migraine treatments work, which is part of why progress stalls.

The numbers, and what they are not

The formal definition in the International Classification of Headache Disorders sets two conditions: headache on 15 or more days a month in someone with a pre-existing headache disorder, plus regular overuse of acute medication for more than three months. What counts as overuse depends on the drug. Paracetamol and anti-inflammatories such as ibuprofen or naproxen are counted at 15 or more days a month. Triptans, ergotamine, codeine-based medicines and combination painkillers are counted at 10 or more days a month.

Two things to hold alongside those figures. First, the classification itself says plainly that these day counts come from expert consensus rather than formal evidence, so they are guide rails and not a bright line you cross on a Tuesday. Second, this is common. Medication overuse headache is estimated at roughly 1 to 2 per cent of the general population, and among people with headache on 15 or more days a month, more than half are thought to have it.

As a rough working guide, The Migraine Trust suggests keeping acute painkillers to no more than two days a week to lower the risk.

This is not a willpower problem

It matters how this gets framed. Nobody develops medication overuse headache by being weak or careless. You had pain, you treated the pain and the treatment worked until it did not. The cycle is self-reinforcing by design: the pain returns as each dose wears off, so you take another, and the pattern quietly sets.

It also tends to happen to people who have not been given much else. If nobody has named your headache type, reviewed whether a preventive might suit you or looked at what is driving the frequency, over-the-counter medication is the only tool you have been left holding.

What changing course involves

The treatment is to stop or substantially reduce the overused medication and to manage the underlying headaches differently. It is straightforward to describe and genuinely hard to do, so it is worth going in with a plan rather than good intentions.

• Expect it to get worse before it gets better. NICE is explicit about this. The most common withdrawal symptom is a worsening headache, sometimes with nausea, poor sleep, restlessness or an upset stomach.
• Agree the method with a clinician. NICE advises stopping overused medication abruptly rather than gradually, for at least a month. The Migraine Trust notes the safest approach varies with the drug and the person, and that some people do better reducing gradually or with closer supervision. Worth discussing rather than assuming.
• Ask about prevention at the same time. If attacks are frequent, a preventive treatment usually gives better control than acute medication alone and reduces the pull back into the cycle.
• Book the review. NICE suggests reassessing four to eight weeks after withdrawal starts, which is also when the picture underneath finally becomes visible.
• Get specialist input where it is warranted. Referral is advised if you are using strong opioids, if previous attempts have not worked, or if other health conditions complicate things.

The question underneath

Stopping the medication answers one question but it leaves a better one open: why were there so many headache days to treat in the first place?

That is where the useful work usually sits. Neck and jaw involvement, disturbed sleep, hormonal patterns, stress that never quite resolves and a headache type that has never been properly named all belong in that conversation. In my experience, people who come out of the cycle and get no answer to that question tend to drift back into it. People who get an answer usually do not.

Do not stop or change prescribed medication without speaking to your GP or prescriber first. If your headaches have become frequent and you are not sure what is driving them, a full assessment is a sensible next step. You are welcome to book an appointment or get in touch.

• International Classification of Headache Disorders, 3rd edition (ICHD-3). 8.2 Medication-overuse headache. ichd-3.org
• The Migraine Trust. Medication overuse headache. migrainetrust.org
• National Institute for Health and Care Excellence. Headaches in over 12s: diagnosis and management (CG150), treatment for medication overuse headache. nice.org.uk
• Medication-overuse headache: a narrative review. The Journal of Headache and Pain, 2024, volume 25, article 89. doi.org/10.1186/s10194-024-01755-w

This article is general information, not a diagnosis or a substitute for individual medical advice.