And why getting both right is the thing most people never figure out.
If you've been living with migraines for any length of time, you've probably heard the words "preventive" and "rescue" thrown around — maybe by a doctor, maybe in a Reddit thread at 2am when you couldn't sleep through the pain.
But what do they actually mean? And more importantly, why does it matter which one you're using, when, and why?
This is one of the most misunderstood areas in migraine treatment. And getting it wrong — using only rescue medication when you need prevention, or expecting prevention to stop an attack that's already started — is one of the main reasons people feel like "nothing works" when treatment actually exists that could change their lives.
Let's clear it up.
The short version
Preventive treatments are taken consistently — daily, weekly, or monthly — whether or not you have a migraine. Their job is to reduce how often migraines happen, how severe they are when they do, and how long they last. They're playing a long game.
Rescue treatments are taken when a migraine has already started, or is about to. Their job is to stop an attack in progress. They're the fire extinguisher, not the smoke detector.
Most people who struggle with migraines are using only one — usually rescue medication — when they need both.
What rescue medications actually do
Rescue medications are designed to interrupt a migraine attack once it's begun. The goal is fast relief: reduce pain, stop nausea, help you function.
The most common rescue medications include:
Triptans — the medication class most people with migraine have tried at some point. Sumatriptan, rizatriptan, eletriptan. They work by binding to serotonin receptors and constricting blood vessels in the brain. They're effective for many people, especially if taken early in an attack. But they're not right for everyone — people with certain cardiovascular conditions can't use them — and they can cause a phenomenon called medication overuse headache (MOH) if used too frequently. More on that in a moment.
Gepants (CGRP receptor antagonists for acute treatment) — a newer class that includes Nurtec ODT (rimegepant) and Ubrelvy (ubrogepant). They work differently from triptans: they block the CGRP receptor rather than constricting blood vessels, which makes them safer for people with cardiovascular risk factors. Nurtec is also unique in that it's approved for both acute and preventive use.
Ditans — a newer class (Reyvow/lasmiditan) that targets the 5-HT1F receptor without cardiovascular effects. Can cause dizziness and sedation.
NSAIDs and combination medications — over-the-counter options like ibuprofen, naproxen sodium, or Excedrin Migraine. Fine for occasional mild attacks. Not the right tool for chronic or severe migraine.
Anti-nausea medications — often used alongside other rescue treatments to manage the nausea and vomiting that accompanies many attacks.
The key thing to understand about all rescue medications: they are reactive. They deal with an attack that's happening. They don't change the frequency of future attacks.
The medication overuse trap
Here's something that doesn't get explained enough: if you use rescue medications too often, they can actually make your migraines worse.
This is called medication overuse headache (MOH) — sometimes called rebound headache. When rescue medications are used more than 10–15 days per month (the threshold varies by medication type), the brain adapts in ways that lower its threshold for pain, leading to more frequent headaches that become progressively harder to treat.
It's one of the most common reasons people escalate from episodic migraine (fewer than 15 headache days per month) to chronic migraine (15 or more days per month).
If you find yourself reaching for rescue medication more than a couple of times a week, that's a signal — not that you need stronger rescue medication, but that you probably need preventive treatment.
What preventive treatments actually do
Preventive (also called prophylactic) treatments don't work like rescue medications. You won't feel them working the day you start. They require consistency and patience — typically 6 to 12 weeks before you see the full effect — and they work by changing the underlying biology that makes migraine attacks happen in the first place.
The goal isn't zero migraines (though some people get there). The goal is meaningful reduction — typically defined as a 50% or greater decrease in monthly migraine days. For someone who has 15 migraine days per month, getting to 7 is life-changing.
Older preventive medications — these have been around for decades and weren't originally developed for migraine:
- Beta-blockers (propranolol, metoprolol) — developed for heart conditions, found to reduce migraine frequency
- Antidepressants (amitriptyline, venlafaxine) — particularly effective for migraine with significant anxiety or depression overlap
- Anticonvulsants (topiramate, valproate) — shown to reduce migraine frequency, but both carry meaningful side effect profiles (cognitive effects with topiramate, weight changes with valproate)
- Calcium channel blockers (verapamil) — used less commonly, more often for cluster headache
These medications work for many people, but they come with significant side effect burdens that cause many patients to stop taking them before they've had a chance to work.
CGRP preventive medications — this is where migraine treatment has been transformed over the last several years.
CGRP stands for calcitonin gene-related peptide. Research over the past three decades has established that CGRP plays a central role in migraine — it's released during attacks, and its levels are elevated in people with chronic migraine. Blocking CGRP (or its receptor) has turned out to be one of the most effective preventive strategies ever developed for migraine.
There are now several CGRP-targeted preventive medications:
Monthly self-injectable CGRP biologics:
- Aimovig (erenumab) — blocks the CGRP receptor
- Ajovy (fremanezumab) — available as monthly or quarterly injection
- Emgality (galcanezumab) — monthly injection, also approved for cluster headache
Quarterly IV infusion:
- Vyepti (eptinezumab) — administered intravenously by a healthcare provider four times a year
Dual-action oral gepant (acute + preventive):
- Nurtec ODT (rimegepant) — taken every other day for prevention, also works as rescue medication
- Qulipta (atogepant) — taken daily for prevention
The clinical data on CGRP biologics is compelling. In pivotal trials, roughly 50% of patients achieved a 50% or greater reduction in monthly migraine days. A meaningful percentage saw even greater benefit — some reporting near-complete resolution of episodic migraine.
They're also well-tolerated compared to older preventives. The most common side effects are injection site reactions and constipation. There are no major cognitive effects. They don't require titration.
For many migraine patients, they represent the first preventive medication that actually worked.
How to know if you need preventive treatment
The American Headache Society recommends considering preventive treatment if you have:
- 4 or more migraine days per month
- Migraines that significantly impair function, even if infrequent
- Rescue medications that don't work well or are contraindicated
- Medication overuse (reaching for rescue treatment too often)
- Particularly severe or prolonged attacks (status migrainosus, hemiplegic migraine)
Many people who would genuinely benefit from preventive treatment never get it — not because they don't qualify, but because they've never had the conversation with a provider who specializes in headache medicine. Access is the problem. There are approximately 564 certified headache specialists in the United States for an estimated 39 million people who suffer from migraine. The waitlist to see one is often six months to a year.
Can you use both at the same time?
Yes — and most migraine treatment plans include both.
Preventive medication reduces how often attacks happen. Rescue medication manages the attacks that still occur. They work together. The goal is to reduce the total burden: fewer attacks, and better tools to handle the ones that remain.
A well-constructed migraine treatment plan typically looks like:
- A preventive medication taken consistently (daily, weekly, or monthly depending on the medication)
- A rescue medication to use when attacks break through
- An understanding of when to use each, and how to avoid the medication overuse trap
What gets in the way
The treatment gap in migraine care is real and documented. According to research published in headache medicine, only about 4.5% of chronic migraine patients clear all three gates of optimal care: receiving a correct diagnosis, accessing preventive treatment, and using rescue medication appropriately.
That's not because the medications don't exist. It's because the system creates friction at every step.
The specialist shortage means many patients are managed by primary care providers who may not be up to date on CGRP therapies. Insurance prior authorization processes can add weeks of delays. The stigma around migraine — the perception that it's "just a headache" — means patients are often dismissed before they get to the right treatment.
Understanding the difference between preventive and rescue treatment is the first step. The second step is finding a provider who will actually help you build the right plan.
A note on expectations and timeline
One of the main reasons people abandon preventive treatment before it works is impatience — and that's understandable when you're living with migraine.
Preventive medications take time. Most CGRP biologics show meaningful effect by week 4, with continued improvement through months 3 to 6. Oral preventives like topiramate take even longer. The rule of thumb: give a preventive medication at least 3 months before deciding it isn't working, assuming you can tolerate it.
This is also why it matters to have ongoing support from a provider who knows your history — not a one-time appointment where you're handed a prescription and sent on your way.
Building a plan that actually works
The goal isn't to survive your next migraine. It's to build a treatment plan that changes the trajectory — fewer attacks, less severe, better tools when they do happen.
That means:
- Knowing whether you need preventive treatment (if you're having 4+ migraine days a month, you almost certainly do)
- Understanding which preventive options are right for you based on your history, other medications, and comorbidities
- Having a rescue medication strategy that doesn't put you at risk for medication overuse
- Consistent follow-up with a provider who tracks your progress over time
That's not complicated. But it requires access to a provider who has the time and expertise to build it with you.
Ready to build your migraine treatment plan?
At Wellday, we specialize in migraine care — not as one condition among dozens, but as the entire focus. Our clinicians work with you to understand your full history, identify whether preventive treatment is right for you, and build a plan that includes both prevention and rescue.
You don't need a referral. You don't need to wait six months for an appointment. Building your migraine profile takes about five minutes, and you'll hear from a clinician within 24 to 48 hours.
This article is for educational purposes and does not constitute medical advice. Treatment decisions should be made in consultation with a licensed healthcare provider who can evaluate your individual history and circumstances.