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Nervous

Triptans

High-yield Verified · Jul 2026

Prototype: sumatriptan

Serotonin (5-HT1B/1D) agonists — the migraine-specific rescue drugs. Not for prevention.

How it works in the body

The system involved, what goes wrong, and how the drug and body interact.

01 Migraine and the trigeminovascular theory

A migraine involves dilation and inflammation of blood vessels around the brain and activation of the trigeminal nerve, which releases vasoactive neuropeptides (like CGRP) that amplify pain. Triptans target this directly: as serotonin 5-HT1B/1D receptor agonists, they constrict the dilated cranial vessels (5-HT1B) and block the release of inflammatory neuropeptides from the trigeminal nerve (5-HT1D). Together this aborts an acute migraine attack.

The key clinical framing: triptans are abortive (rescue) drugs, most effective taken early in an attack — they are not used for prevention (that’s beta-blockers, topiramate, CGRP antibodies, etc.).

Triptans constrict cranial vessels (5-HT1B) and block trigeminal neuropeptide release (5-HT1D).

02 The vasoconstriction catch — the heart

The same vasoconstriction that helps cranial vessels is not selective — triptans can also constrict coronary arteries. That makes them contraindicated in ischemic heart disease, prior MI, uncontrolled hypertension, and stroke/TIA history (and in the rare hemiplegic/basilar migraines). Screen cardiovascular risk before prescribing.

Two more rules: because triptans are serotonergic, combining them with SSRIs/SNRIs/MAOIs can (rarely) contribute to serotonin syndrome; and overusing acute migraine drugs causes medication-overuse (rebound) headache. Triptans should not be taken with ergot drugs or another triptan within 24 hours (additive vasoconstriction).

Non-selective vasoconstriction → the cardiovascular contraindications.

Drug names

Generic Brand
sumatriptan Imitrex
rizatriptan Maxalt
eletriptan Relpax

Indications

  • Acute treatment of migraine (with or without aura)
  • Acute treatment of cluster headache (subcutaneous sumatriptan)

Mechanism of action

Agonize serotonin 5-HT1B receptors (constricting dilated cranial blood vessels) and 5-HT1D receptors (inhibiting release of pro-inflammatory neuropeptides from trigeminal nerve endings) — aborting the migraine. Abortive, not preventive.

In plain terms
They tighten the swollen blood vessels around the brain and calm the nerve that drives migraine pain — stopping an attack in progress.

Therapeutic effects — what you'll see working

Success is aborting the attack — best when taken early. Not for daily/preventive use; limit frequency to avoid rebound headache.

Aborts acute migraine
Aborts acute migraine
Cranial vasoconstriction plus reduced neuropeptide release relieves the headache and associated nausea/photophobia, especially when taken at onset.

Adverse effects

Most effects are mild "triptan sensations"; the serious concern is coronary vasoconstriction, and serotonin syndrome with combinations.

Caution: Common
Tingling/paresthesia, flushing, a sense of chest/throat/neck tightness or pressure, dizziness, drowsiness.
A non-cardiac chest/throat tightness ("triptan sensations") is common and usually benign — but must be distinguished from true cardiac chest pain.
Warning: Serious Report immediately
Coronary vasospasm/MI (rare), serotonin syndrome (with serotonergic drugs), medication-overuse headache, marked BP elevation.
Rare coronary vasospasm can cause angina or MI — the basis for the cardiovascular contraindications. Serotonin syndrome can occur with SSRIs/SNRIs/MAOIs.

Interactions

SSRIs / SNRIs / MAOIs drug
Additive serotonergic load → serotonin syndrome (agitation, hyperreflexia/clonus, hyperthermia, autonomic instability).
Ergot alkaloids or another triptan (within 24 h) drug
Additive vasoconstriction — do not combine.

Contraindications

The contraindications are all the vascular beds where extra vasoconstriction is dangerous, plus the drug combinations.

Ischemic heart disease / prior MI / coronary vasospasm (Prinzmetal)
Triptans constrict coronary arteries, risking angina, MI, or arrhythmia.
Uncontrolled hypertension; history of stroke/TIA; peripheral vascular disease
Vasoconstriction can precipitate a vascular event in these beds.
Ergot alkaloids or another triptan within 24 h; recent MAOI
Additive vasoconstriction (ergots/triptans) or serotonin syndrome (MAOIs).
Hemiplegic or basilar migraine
These variants are excluded from triptan labeling due to stroke concern.

When to hold

Assess before giving — these findings mean hold the dose and act.

CAD / ischemic heart disease, prior MI, or uncontrolled hypertension
Contraindicated — non-selective coronary vasoconstriction can cause chest tightness, angina, or MI; screen cardiovascular risk before the first dose.

Nursing considerations

The RN-specific layer — each action paired with the reason it matters.

Screening & administration
Screen for cardiovascular disease/risk factors before the first dose; take the triptan early in an attack.
Why: Coronary vasoconstriction drives the contraindications; early use is most effective.
Limit frequency and review other serotonergic drugs.
Why: Overuse causes rebound headache; combinations risk serotonin syndrome.
Patient teaching
Report chest pain/pressure, jaw/arm pain, or shortness of breath, and note the difference from benign "triptan tightness."
Why: True cardiac symptoms could signal coronary vasospasm and need urgent evaluation.

Sources

Educational summary for nursing students. Always verify against current prescribing information and your institution's protocols before administering. Not medical advice.