Almotriptan: migraine relief, how to take it, side effects
Last updated September 7, 2026.
**Almotriptan is a prescription tablet that stops a migraine attack after it starts, and it belongs to the triptan class of serotonin 5-HT1B/1D receptor agonists.** It tightens blood vessels that have widened around the brain and calms the nerve signals that carry migraine pain, so the headache, nausea, and light sensitivity usually settle together. It treats attacks that are already happening and does not prevent future ones. The safety point that matters most: almotriptan narrows arteries, so it is not for people with coronary artery disease, a past heart attack or stroke, or blood pressure that is not under control.
What does it treat?
Almotriptan treats acute migraine attacks with or without aura in adults and in adolescents 12 to 17 years old. The pattern it is meant for is a headache that builds over minutes to hours, often on one side, often throbbing, and usually paired with nausea, sensitivity to light or sound, or an urge to lie down in a dark room. It works best when you take it early in the attack, while the pain is still mild to moderate. It is not approved for cluster headache, and it is not used for hemiplegic migraine or basilar migraine, which are attacks that come with one-sided weakness or with symptoms coming from the brainstem such as double vision, slurred speech, or vertigo. Almotriptan is sold only as a single ingredient tablet, so there is no combination product for it the way sumatriptan is also sold combined with naproxen. It also does not fix tension headache or sinus pressure, so if your pain never has migraine features, a different plan usually fits better.
How do you take it?
Almotriptan comes as 6.25 mg and 12.5 mg tablets you swallow whole. The usual adult dose is one 12.5 mg tablet at the first sign of a migraine, and 6.25 mg is used when you are more sensitive to side effects or when your doctor wants to start low. If the headache comes back after it responded, you may take one more tablet at least 2 hours after the first. The daily ceiling is 2 doses, or 25 mg, in any 24 hours. If the first dose does nothing at all, a second dose for that same attack has not been shown to help, so call your doctor instead of redosing. If you have severe kidney or liver problems, the starting dose is 6.25 mg and the ceiling drops to 12.5 mg in 24 hours. Adolescents 12 to 17 take a single 6.25 mg or 12.5 mg dose; a second dose for the same attack has not been shown to work in this age group. Food does not matter, so take it with or without a meal. There is no missed dose to make up, because you take it only when an attack starts, not on a schedule. The label notes that safety has not been established for treating more than 4 migraines in 30 days, so track your use and call your doctor if you need it more often than that, if attacks are getting more frequent, or if your headaches start feeling different from your usual pattern.
Side effects to know
- Common: The common effects are mild and short: nausea, dry mouth, sleepiness, dizziness, tingling or a warm flushed feeling, and a brief sense of pressure or tightness in the chest, throat, neck, or jaw.
- Serious: Stop almotriptan and get medical help right away for chest pain or chest pressure that is severe or does not pass, shortness of breath, a fast or irregular heartbeat, sudden face drooping, arm weakness, trouble speaking, or sudden vision loss, since these can signal a heart or brain artery problem. Also seek care for severe stomach pain with bloody diarrhea, or for agitation, hallucinations, fever, sweating, shivering, twitching muscles, or a racing heart, which can be serotonin syndrome when almotriptan is combined with an antidepressant.
Who should not take it?
Do not take almotriptan if you have coronary artery disease or angina, a history of heart attack, coronary artery spasm including Prinzmetal angina, a past stroke or TIA, peripheral vascular disease, ischemic bowel disease, uncontrolled high blood pressure, Wolff-Parkinson-White syndrome or another arrhythmia tied to an extra conduction pathway, hemiplegic or basilar migraine, or severe liver disease. Talk with your doctor before starting if you have risk factors for heart disease such as high blood pressure, high cholesterol, diabetes, smoking, obesity, a strong family history, or being past menopause, because the first dose is sometimes taken in a medical office with a heart tracing. Do not take almotriptan within 24 hours of another triptan or any ergotamine type medicine, including dihydroergotamine or methysergide. Tell your doctor about SSRIs, SNRIs, and other serotonin raising medicines because of serotonin syndrome risk, about MAO inhibitors, and about strong CYP3A4 blockers such as ketoconazole, itraconazole, ritonavir, and clarithromycin, which raise almotriptan levels. For pregnancy, current FDA labeling says the available data are not enough to establish a drug related risk of birth defects or miscarriage, so weigh it with your doctor. It is not known whether almotriptan passes into human breast milk, so discuss timing if you are nursing. Alcohol does not interact with almotriptan directly, but it triggers migraine for many people and adds to the drowsiness and nausea, so it is worth skipping during an attack.
When is it an emergency?
Call 911 in the US for crushing or spreading chest pain, trouble breathing, fainting or collapse, one sided weakness, face drooping, slurred speech, or sudden loss of vision. Call 911 for signs of a severe allergic reaction as well: swelling of the lips, tongue, or throat, widespread hives, wheezing, or feeling like your airway is closing. Serotonin syndrome is another reason to be seen the same day or sooner, and it looks like agitation or confusion, a racing heart, high blood pressure, fever, heavy sweating, shivering, muscle twitching or stiffness, and diarrhea, usually starting within hours of a new dose or a new antidepressant. If you or someone else takes too much almotriptan, or a child swallows any, call Poison Control at 1-800-222-1222 right away, even if the person seems fine, since overdose can raise blood pressure and strain the heart and the label calls for monitoring for at least 20 hours. Severe belly pain with bloody diarrhea after a dose also needs urgent in person evaluation.
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Common questions
What is the maximum amount of almotriptan I can take in a day?
Adults can take up to 2 doses in 24 hours, for a maximum of 25 mg. Take the first tablet, 6.25 mg or 12.5 mg, when the attack starts, and if the headache comes back after responding you can take a second tablet at least 2 hours later. If severe kidney or liver disease is in your history, the ceiling drops to 12.5 mg in 24 hours. If the first dose does nothing for that attack, a second dose has not been shown to help, so use a rescue plan your doctor gave you instead. Also watch the monthly count, since the label notes safety was not established for treating more than 4 migraines in 30 days.
Can I drink alcohol while taking almotriptan?
There is no direct interaction between alcohol and almotriptan. The practical problem is that alcohol, especially red wine and beer, is a common migraine trigger and can start the next attack. Alcohol also adds to the drowsiness, dizziness, and nausea that almotriptan can cause on its own. During an active attack, skip it. If you drink socially between attacks, keep it moderate and notice whether your headaches cluster after drinking.
Is almotriptan safe during pregnancy or while breastfeeding?
Current FDA labeling says the available human data are not sufficient to establish a drug related risk of major birth defects or miscarriage, so the decision is made case by case with your doctor. Many people find migraines change during pregnancy, and non drug steps plus acetaminophen are often tried first. It is not known whether almotriptan passes into human breast milk, though it is present in the milk of rats. If you are nursing, ask your doctor about timing doses relative to feeds. Tell your care team early if you are pregnant, trying to conceive, or breastfeeding so the plan can be set before an attack hits.
Does almotriptan need to be taken with food?
No. Food does not meaningfully change how much almotriptan your body absorbs, so you can take it with or without a meal. What matters far more is timing: take it as soon as you recognize the attack, while the pain is still mild to moderate, because waiting until the headache peaks makes it work less well. If nausea is already strong and you are worried about keeping a tablet down, tell your doctor, since a nasal or injectable triptan may suit those attacks better. Swallow the tablet whole with water.
What are the signs of taking too much almotriptan?
Overdose can push blood pressure up and strain the heart, so watch for chest pain or pressure, a pounding or irregular heartbeat, severe headache, dizziness, or fainting. Call Poison Control at 1-800-222-1222 right away for any suspected overdose, including a child swallowing a tablet, and call 911 for chest pain, collapse, or trouble breathing. The label directs monitoring for at least 20 hours after an overdose or until symptoms settle, so do not assume feeling fine at the two hour mark means you are clear. Bring the bottle with you so the team knows the exact strength and count.
What medicines interact with almotriptan?
Do not take another triptan or any ergotamine type drug, including dihydroergotamine, within 24 hours of almotriptan, because stacking them narrows arteries too much. SSRIs, SNRIs, and other serotonin raising drugs can combine with almotriptan to cause serotonin syndrome, so report agitation, fever, sweating, fast heartbeat, or twitching muscles that starts after a dose. Strong CYP3A4 blockers such as ketoconazole, itraconazole, ritonavir, and clarithromycin raise almotriptan levels, and the lower 6.25 mg dose is used with them. MAO-A inhibitors also raise levels. Give your doctor a full list including over the counter products and supplements before you start.