Imitrex vs. Aimovig

See how Imitrex and Aimovig compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Imitrex is a fast-acting triptan taken at the first sign of a migraine, while Aimovig is a monthly injection designed to prevent migraines before they begin.

  • Imitrex comes in tablet, injection, and nasal spray forms for quick symptom relief but is not meant for daily prevention.

  • Aimovig blocks the CGRP receptor thought to drive migraine attacks and is given once a month, with fewer cardiovascular restrictions than triptans like Imitrex.

Imitrex vs. Aimovig Drug Summary

Imitrex

Imitrex (sumatriptan) is a triptan that stops a migraine attack already underway by narrowing blood vessels and blocking pain signals in the brain. It is taken as a tablet, injection, or nasal spray at the first sign of migraine, with a repeat dose allowed two hours later if needed.

Aimovig

Aimovig (erenumab-aooe) is a monthly injectable antibody that blocks the CGRP receptor believed to drive migraine attacks, helping prevent them before they start. It is given as a single subcutaneous injection once a month and is not used to treat an attack that has already begun.

Imitrex vs. Aimovig Side Effects

Imitrex

Most common
pain/pressure sensations (8%)
warm/cold sensation (up to 3%)
malaise/fatigue (up to 3%)

Aimovig

Most common
injection site reactions (5-6%)
constipation (up to 3%)
cramps/muscle spasms (2%)

Imitrex vs. Aimovig Dosage

Imitrex

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 25 mg, 50 mg, or 100 mg At the start
Maximum dose Repeat dose, max 200mg/day If needed
Dose changes 1 increase As tolerated

Aimovig

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 70 mg once monthly At the start
Maximum dose 140 mg once monthly If needed
Dose changes 1 increase As tolerated

Imitrex vs. Aimovig Indications

Imitrex

Imitrex is FDA-approved for acute treatment of migraine attacks with or without aura in adults, and the injection form is also approved for cluster headache. It is meant to treat symptoms once they start, not to prevent future attacks.

  • Acute migraine with or without aura in adults

  • Acute cluster headache treatment (injection only)

  • Not approved for migraine prevention

  • Not approved for pediatric oral use

Aimovig

Aimovig is FDA-approved for the preventive treatment of migraine in adults, aiming to reduce how often attacks occur over time. It is not intended to treat a migraine attack that has already started, and it is approved only for adult use.

  • Preventive treatment of migraine in adults

  • Reduces monthly migraine frequency over time

  • Not approved to treat an active migraine attack

  • Approved for adult use only

Imitrex vs. Aimovig Pros and Cons

Imitrex

Imitrex offers rapid relief once a migraine attack begins, with decades of clinical use and multiple delivery options. It is not designed for prevention and carries cardiovascular restrictions that limit its use in some patients.

Pros

  • Multiple forms (tablet, injection, nasal spray) for fast relief

  • Decades of clinical use and established safety data

  • Can be paired with a separate preventive therapy

  • Available as a lower-cost generic tablet

Cons

  • Not effective for migraine prevention

  • Contraindicated in cardiovascular and vascular disease

  • Risk of medication overuse headache with frequent use

  • Cannot be combined with other triptans or ergots within 24 hours

Aimovig

Aimovig is designed to reduce migraine frequency with just one injection a month, and it avoids the cardiovascular contraindications common to triptans. It does not relieve a migraine already in progress and has less long-term data than older options.

Pros

  • Only one injection needed per month

  • Prevents migraines before they start, rather than treating them

  • No cardiovascular contraindications like triptans

  • Can be used alongside a separate acute treatment

Cons

  • No generic version currently available

  • Does not relieve an active migraine attack

  • Fewer years of long-term safety data (approved 2018)

  • Constipation risk, including rare serious complications

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