Eletriptan Side Effects: What to Expect and When to Call Your Doctor

Eletriptan (Relpax) is one of the most effective triptans for treating acute migraine attacks, but like all medications, it comes with a side effect profile you should understand before taking it. Most side effects are mild and go away quickly. A small number are serious and require immediate medical attention. Here's what to expect.

Does Eletriptan Have a Boxed Warning?

No. The FDA has not issued a boxed warning (the most serious type of drug warning) for eletriptan. This distinguishes it from some other medications in broader use. However, eletriptan does carry important warnings and precautions, particularly around cardiovascular events, that patients and prescribers should be aware of.

Common Side Effects of Eletriptan

In clinical trials involving over 4,500 patients, the most commonly reported side effects with eletriptan were:

Asthenia (weakness or fatigue) — The most frequently reported side effect; a general feeling of tiredness or weakness that usually resolves within a few hours

Nausea — May overlap with migraine-associated nausea; taking eletriptan with a small amount of food may help

Dizziness — A light-headed or dizzy feeling, especially in the hour after taking the dose

Somnolence (drowsiness) — Many patients feel sleepy after taking eletriptan; this is dose-related and more common at 40 mg than 20 mg

Chest tightness or pressure — A tightening, pressure, or heaviness in the chest, throat, jaw, or neck area. This is a triptan class effect caused by vasoconstriction. It is usually brief and benign, but can mimic cardiac symptoms (see serious side effects below)

Dry mouth, flushing, paresthesia (tingling) — Less common; tingling in extremities (hands, feet) or face is a known triptan effect

These side effects are dose-related — they occur more often and more intensely at the 40 mg dose than the 20 mg dose. The frequency of side effects did not increase when two doses were taken within 24 hours, according to clinical trial data.

Serious Side Effects: When to Seek Immediate Care

While rare, the following serious adverse events are associated with eletriptan and require immediate medical attention:

Myocardial ischemia or infarction (heart attack): Due to coronary vasoconstriction. Risk is highest in patients with underlying coronary artery disease or cardiovascular risk factors. Chest pain that is severe, persistent, or radiates to the arm or jaw after taking eletriptan requires emergency evaluation.

Vasospasm (coronary or peripheral): Eletriptan can cause arterial narrowing. Severe or persistent symptoms of vascular spasm — intense chest pain, limb numbness, color changes in fingers or toes — require immediate evaluation.

Serotonin syndrome: Risk is elevated when eletriptan is combined with other serotonergic drugs (SSRIs, SNRIs, MAOIs). Symptoms include agitation, rapid heart rate, high temperature, tremor, and muscle twitching. Requires urgent medical attention.

Cerebrovascular events: Stroke-like symptoms (sudden weakness, face drooping, slurred speech, vision changes) following eletriptan use require emergency evaluation.

Severe allergic reaction: Anaphylaxis, angioedema (swelling of face, lips, throat), severe rash, or difficulty breathing require emergency care.

The Chest Tightness Question: Is It Serious?

Chest tightness after taking eletriptan is one of the most confusing side effects. It is common in triptan users — often described as a sensation of pressure, heaviness, or tightness in the chest, neck, jaw, or shoulders. In most cases, this is a benign effect of the medication's vasoconstriction mechanism and resolves within 15–30 minutes.

However, the same symptoms can indicate a cardiac event in patients with underlying heart disease. If the chest tightness is severe, doesn't resolve quickly, or is accompanied by sweating, arm pain, or shortness of breath — treat it as a cardiac emergency and call 911.

If you are at higher cardiac risk, your doctor may perform a cardiovascular evaluation before starting eletriptan and may have you take the first dose in a clinical setting.

Medication Overuse Headache: A Risk With All Triptans

Using triptans on 10 or more days per month can actually worsen headache frequency — a condition called medication overuse headache (MOH). If you find yourself needing eletriptan more than 3 times per week, talk to your doctor. This is a signal that preventive therapy may be warranted.

For more on eletriptan drug interactions that can worsen side effects, read our guide on eletriptan drug interactions. If you're having trouble finding your medication, medfinder can help locate it at pharmacies near you.