Eletriptan: what it treats, how to take it, side effects
Last updated September 3, 2026.
Eletriptan is a triptan - a selective serotonin receptor agonist that narrows vessels in the brain and halts the migraine pain cascade. You may know it as Relpax. It treats attacks in progress; it does not prevent them or reduce how many come.
What does it treat?
Migraine headaches - severe throbbing pain, sometimes with nausea and strong reactions to light and sound.
How do you take it?
One tablet at the first sign of a migraine. If symptoms improve but return after 2 hours or longer, a second tablet is allowed; if they do not improve, no second tablet before calling your doctor. Your doctor sets the 24-hour maximum. The interaction window specific to eletriptan: certain medications - some antifungals, antibiotics, and others - sharply raise its levels, and the combination is off-limits within 72 hours of those drugs; the full list gets screened by your pharmacist. Call your doctor if the headaches do not improve or start coming more often - that pattern changes the plan. Missed-dose logic does not apply: this is an as-needed rescue, taken only when an attack starts.
Side effects to know
- Common: weakness, tiredness, dizziness, drowsiness, upset stomach, nausea, heartburn, headache, dry mouth, and feeling warm or cold.
- Serious - call your doctor immediately or get emergency care: tightness, pain, pressure, or heaviness in the chest, throat, neck, or jaw; slow or difficult speech; weakness or numbness of an arm or leg; vomiting; sudden or severe stomach pain; bloody diarrhea; constipation; rapid, pounding, or irregular heartbeat; shortness of breath; and lightheadedness.
Who should not take it?
Anyone with heart disease, uncontrolled high blood pressure, circulation problems, or stroke history - the vessel-narrowing rules them out. Flag liver or kidney disease and hemiplegic or basilar migraine. Within 24 hours of another triptan or ergot: no. Within 72 hours of certain antibiotics, antifungals, or HIV medications: no - this is the eletriptan-specific trap, and it is why the pharmacist screens every new prescription against it. If you become pregnant, call your doctor.
When is it an emergency?
Building chest pressure, one-sided weakness, garbled speech, or a pounding irregular heartbeat is a 911 call. For an overdose, call Poison Control at 1-800-222-1222. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
What is the 72-hour rule I heard about?
Eletriptan's signature interaction: certain drugs - ketoconazole-type antifungals, clarithromycin-type antibiotics, some HIV medications, and others - block its breakdown and multiply its levels. The rule: no eletriptan within 72 hours of those medications. This is why the pharmacist screens every new prescription against your migraine medication, and why "just an antibiotic" is never just an antibiotic on this drug.
How is eletriptan different from other triptans?
Same family, different metabolism: it is effective and well-studied, with the trade-off of that 72-hour interaction window. Some triptans come as dissolving tablets or nasal sprays for vomiting migraines; eletriptan is a swallowed tablet. Among triptans, the best one is the one that stops your attacks reliably - switching within the family is a normal, cheap experiment your doctor can run.
Why the first-sign timing rule?
The migraine cascade builds momentum - vessels, inflammation, and pain signals reinforcing each other. A triptan interrupts the loop, and the earlier the interruption, the better it works. Taken at full-blown pain, relief is slower and less complete. Dose at your earliest reliable symptom, not after the "maybe it will pass" hour.
What is medication-overuse headache?
The trap of the effective rescue: triptans taken too often sensitize the system - attacks come more frequently, and the medication feeds the cycle. The defenses: the 24-hour maximum, the monthly tablet budget your doctor sets, and the escalation rule - headaches getting more frequent on a triptan is a call-your-doctor pattern (it is literally on the label), not a reason to quietly take more.
Why did my doctor ask about my heart?
Triptans narrow coronary vessels slightly - fine in a healthy heart, dangerous in coronary disease, uncontrolled hypertension, or after stroke. The screening is the eligibility check. And the rule persists after the prescription: new cardiac symptoms or diagnoses later mean the triptan gets re-evaluated. The chest-pressure symptom after a dose is the one that never gets dismissed.
What if the first tablet does nothing?
No second tablet without calling your doctor - that is the label rule, and it exists because non-response is information: wrong timing, wrong drug for you, or a headache that is not a migraine. The second tablet is reserved for the migraine that improved and then returned after 2 hours. Recurrent non-response is a switching conversation - the triptan family has options.