Migraines are one of those USMLE “bread-and-butter” topics that keep showing up because they blend diagnosis + acute therapy + prevention + contraindications. The trick isn’t just knowing that “triptans treat migraines”—it’s knowing when they’re unsafe, what to do instead, and how to choose prophylaxis based on comorbidities.
Tag: Neurology > Seizures, Headache & Sleep
The Q-bank vignette (typical presentation)
A 28-year-old woman has recurrent headaches lasting 6–24 hours with unilateral throbbing pain, photophobia, and nausea. Headaches worsen with activity and occur 3–4 times per month, sometimes preceded by visual scintillations (aura). She is otherwise healthy. Neuro exam is normal. She asks for a medication to take at the start of a headache that will most effectively abort symptoms.
Correct answer: Sumatriptan (a triptan)
Why the correct answer is correct: Triptans for acute migraine
What triptans do
Triptans (eg, sumatriptan, rizatriptan, zolmitriptan) are selective 5-HT agonists that:
- Constrict dilated intracranial vessels (5-HT)
- Decrease trigeminal nerve pain transmission and neuropeptide release, including CGRP (5-HT)
When to use them
They’re first-line for moderate to severe migraine or mild migraine that doesn’t respond to NSAIDs.
High-yield adverse effects
- Chest/neck tightness, flushing, paresthesias (can feel scary but often benign)
- Rare: serotonin syndrome risk when combined with other serotonergic meds (eg, SSRIs/SNRIs), classically tested even if uncommon
Absolute contraindications (USMLE loves these)
Triptans are vasoconstrictors, so avoid in:
- Coronary artery disease, prior MI, Prinzmetal angina
- Stroke/TIA
- Uncontrolled hypertension
- Hemiplegic or basilar migraine (testable)
- Use caution in pregnancy (often prefer nonpharm/acetaminophen; management individualized)
Step-back: Acute vs preventive migraine therapy (the exam framework)
Acute (abortive) therapy
Goal: stop the current attack
- NSAIDs (ibuprofen, naproxen) and acetaminophen
- Triptans
- Antiemetics (metoclopramide, prochlorperazine) as adjuncts
- CGRP antagonists (“gepants”) and ditans (see distractors)
Preventive (prophylactic) therapy
Goal: reduce frequency/severity over weeks to months.
Start prophylaxis when (common test thresholds):
- migraine days/month, or
- Significant disability despite good acute therapy, or
- Contraindication to acute meds, or
- Overuse of acute meds (medication-overuse headache risk)
The distractor breakdown: why every other option is wrong (or “right in a different scenario”)
Below is a “what the test writer is thinking” guide.
1) Propranolol (or other beta-blocker)
Why it’s tempting: You’ve heard “beta-blockers prevent migraines.”
Why it’s wrong here: The vignette asks for an abortive medication “to take at the start.” Beta-blockers are prophylaxis, not acute treatment.
High-yield use:
- Best when comorbid hypertension, tachyarrhythmia, or performance anxiety
- Options: propranolol, metoprolol, timolol
High-yield contraindications/pearls:
- Avoid in asthma/COPD (nonselective beta-blockers), bradycardia, certain heart blocks
- Side effects: fatigue, depression, erectile dysfunction (common test fodder)
2) Amitriptyline
Why it’s tempting: It’s a migraine preventive and helps sleep.
Why it’s wrong here: Again, it’s prophylaxis, not acute abortion.
High-yield use:
- Great choice if comorbid depression, insomnia, or neuropathic pain
High-yield adverse effects (antimuscarinic + cardiac):
- Dry mouth, constipation, urinary retention, blurry vision
- Sedation, weight gain
- QT prolongation and arrhythmias in overdose (TCA toxicity is a classic USMLE topic)
3) Topiramate
Why it’s tempting: Very common prophylaxis choice, and it’s an anticonvulsant (Neurology crossover).
Why it’s wrong here: Still preventive, not abortive.
High-yield facts:
- Side effects: cognitive slowing (“dopamax”), paresthesias, weight loss
- Can cause kidney stones
- Inhibits carbonic anhydrase → risk of metabolic acidosis
- Teratogenic risk (counseling is often tested)
4) Valproate
Why it’s tempting: Another anticonvulsant used for migraine prophylaxis.
Why it’s wrong here: Not for acute attacks; also often avoided depending on patient context.
High-yield facts:
- Side effects: weight gain, tremor, hair loss
- Hepatotoxicity, pancreatitis
- Neural tube defects (eg, spina bifida) → avoid in pregnancy/patients who may become pregnant when possible
5) Verapamil
Why it’s tempting: Calcium channel blocker = headache med? Some students associate it with prevention.
Why it’s usually wrong in classic migraine vignettes:
- More strongly associated with cluster headache prophylaxis (high-yield)
- Not first-line for typical migraine prophylaxis in many test frameworks (though sometimes used)
Cluster tie-in you should know:
- Cluster: unilateral periorbital pain + autonomic symptoms (lacrimation, rhinorrhea), often at night
- Acute: high-flow O, triptan
- Preventive: verapamil
6) Ergotamine / Dihydroergotamine (DHE)
Why it’s tempting: Also aborts migraine via serotonergic effects.
Why it’s wrong (most of the time):
- Triptans are generally preferred due to better tolerability/safety
- Ergots are more toxic and also vasoconstrictive
High-yield contraindications:
- Pregnancy (uterotonic/vasoconstrictive)
- Vascular disease similar to triptans
High-yield adverse effects: nausea/vomiting, vasospasm/ischemia
7) Opioids (eg, oxycodone, hydromorphone)
Why it’s tempting: Severe pain → opioids “work.”
Why it’s wrong (USMLE stance):
- Not first-line for migraine
- High risk of dependence and medication-overuse headache
- Often worsen long-term control and increase ED revisits
8) Butalbital-containing products
Why it’s tempting: Some patients have them historically.
Why it’s wrong:
- High risk of medication-overuse headache and dependence
- Not recommended as routine migraine therapy
9) High-flow oxygen
Why it’s tempting: You remember oxygen treats headaches.
Why it’s wrong here:
- That’s cluster headache, not classic migraine.
10) CGRP pathway drugs (newer, still testable)
Two big categories:
- “Gepants” (ubrogepant, rimegepant): CGRP receptor antagonists (acute ± prevention depending on agent)
- Monoclonal antibodies (erenumab, fremanezumab, galcanezumab): prevention
Why they’re often wrong as the “best answer”:
- Many question banks still prioritize classic first-line: NSAID → triptan for acute migraine without contraindications
- These are commonly used when triptans are contraindicated or ineffective
High-yield pearl: CGRP agents do not cause vasoconstriction (advantage in patients with vascular disease).
11) Lasmiditan (a “ditan”)
Why it’s tempting: Acute migraine med.
Why it may be wrong here: Triptan is the classic go-to when no contraindications.
High-yield difference:
- 5-HT agonist → abortive migraine without vasoconstriction
- Side effect: dizziness/sedation; patients are advised not to drive after dosing (commonly emphasized)
High-yield table: migraine meds at a glance
| Goal | First-line options | Key mechanism | Must-know contraindications / pearls |
|---|---|---|---|
| Acute (abort) | NSAIDs, triptans | COX inhibition; 5-HT agonism | Triptans contraindicated in CAD, stroke/TIA, uncontrolled HTN, hemiplegic/basilar migraine |
| Acute (alternatives) | Gepants, lasmiditan, antiemetics | CGRP block; 5-HT agonism; D2 block | Good when triptans contraindicated; lasmiditan sedation |
| Prevention | Propranolol, topiramate, amitriptyline, valproate, CGRP mAbs | Various | Match to comorbidities; avoid valproate/topiramate in pregnancy when possible |
Classic USMLE “comorbidity matching” for prophylaxis
When prophylaxis is indicated, pick based on what else is going on:
- Hypertension / tremor / performance anxiety → propranolol
- Obesity → topiramate (weight loss)
- Depression / insomnia → amitriptyline
- Bipolar disorder → sometimes valproate (but pregnancy concerns)
- Vascular disease (can’t use triptans) and frequent migraines → consider CGRP options for prevention; for acute consider gepants/lasmiditan
Exam traps & one-liners you’ll want on test day
- Migraine + aura: transient neurologic symptoms (often visual) preceding headache; still treat acute pain similarly, but remember stroke risk is slightly increased (esp. smokers/estrogen-containing OCPs).
- Status migrainosus: migraine lasting >72 hours (often needs more intensive therapy; ED regimens may include IV fluids, NSAIDs, antiemetics, magnesium depending on protocol).
- Medication-overuse headache: frequent use of triptans/NSAIDs/opioids can perpetuate headaches; prevention strategies and tapering matter.
- If the vignette includes CAD history or uncontrolled HTN, the “triptan” answer choice becomes a trap—pivot to non-vasoconstrictive acute options.
Take-home: what the question was really testing
- Recognize a classic migraine phenotype.
- Choose the correct acute abortive therapy (triptan) when no contraindications.
- Know which options are prevention (beta-blockers, topiramate, TCAs, valproate) vs acute.
- Identify red-flag contraindications where triptans are unsafe—and what to use instead.