Generic Name: Eletriptan
Therapeutic Class: 5-HT1B/1D Receptor Agonist (Triptan) / Anti-migraine
Indications
Eletriptan is a selective serotonin receptor agonist used for the acute management of migraine headaches:
- Acute Migraine: Indicated for the acute treatment of migraine attacks with or without aura in adults.
- Fast Action: Used specifically when a rapid onset of pain relief is required compared to older triptans.
- Recurrence Prevention: Due to its high receptor affinity, it is effective in reducing the incidence of migraine recurrence within 24 hours.
Dosage & Administration
Eletriptan hydrobromide tablets should be swallowed whole with water. It is not intended for the prophylactic (preventative) therapy of migraine.
- Adults (18-65 years): The usual starting dose is 20 mg or 40 mg. In clinical trials, the 40 mg dose showed greater efficacy but a slightly higher rate of side effects.
- Repeat Dosing: If the migraine returns after initial relief, a second dose may be taken, but not within 2 hours of the first dose.
- Maximum Dose: The maximum single dose is 40 mg. The total daily dose must not exceed 80 mg in any 24-hour period.
- Renal/Hepatic Impairment: No dose adjustment is required for mild-to-moderate renal or hepatic impairment, though the 20 mg starting dose is recommended. It is contraindicated in severe hepatic failure.
Description & Pharmacokinetics
Eletriptan is a second-generation triptan that exhibits high selectivity for 5-HT1B, 5-HT1D, and 5-HT1F receptors.
The primary mechanism involves the constriction of painfully dilated intracranial blood vessels and the inhibition of pro-inflammatory neuropeptide release from the trigeminal nerve system.
Pharmacokinetics: Eletriptan is rapidly absorbed from the gastrointestinal tract with a bioavailability of approximately 50%. Peak plasma concentrations ($C_{max}$) are achieved within 1.5 hours. It is approximately 85% protein-bound. The drug is primarily metabolized by the cytochrome P450 enzyme CYP3A4. It has a mean elimination half-life of about 4 hours.
Pharmacokinetics: Eletriptan is rapidly absorbed from the gastrointestinal tract with a bioavailability of approximately 50%. Peak plasma concentrations ($C_{max}$) are achieved within 1.5 hours. It is approximately 85% protein-bound. The drug is primarily metabolized by the cytochrome P450 enzyme CYP3A4. It has a mean elimination half-life of about 4 hours.
Extra Important Information: Usage Insights
- Speed of Onset: Eletriptan is one of the fastest-acting oral triptans, often providing relief within 30 to 60 minutes.
- CYP3A4 Warning: Because it is metabolized by CYP3A4, it should not be used within 72 hours of potent inhibitors (like certain antibiotics or antifungals).
- Aura Phase: While it can be taken during the aura phase, it is most effective when taken once the headache (pain) phase begins.
Side Effects
Most side effects are mild and transient. They include:
- Common: Asthenia (weakness), somnolence (drowsiness), nausea, and dizziness.
- Sensory: Paresthesia (tingling or numbness) and flushing.
- Gastrointestinal: Dry mouth and dyspepsia.
- Chest/Throat: Pain, tightness, or pressure in the chest, neck, or jaw (usually non-cardiac).
Pregnancy & Lactation
- Pregnancy: Eletriptan is classified as Category C. There are no adequate studies in pregnant women. Use only if clearly needed and benefits outweigh risks.
- Lactation: Eletriptan is excreted in human breast milk. To minimize infant exposure, breastfeeding should be avoided for 24 hours after treatment.
Precautions & Interactions
- Cardiovascular Contraindications: Must not be used in patients with ischemic heart disease, coronary vasospasm (Prinzmetal’s angina), history of stroke/TIA, or severe uncontrolled hypertension.
- Drug Interactions: Contraindicated within 72 hours of strong CYP3A4 inhibitors (e.g., Ketoconazole, Itraconazole, Clarithromycin, Ritonavir).
- Serotonin Syndrome: Caution when combined with SSRIs or SNRIs due to the risk of serotonin syndrome (confusion, sweating, tachycardia).
- Ergot Derivatives: Do not use within 24 hours of ergotamine-containing medications.
Storage
Store at 20°C to 25°C. Keep in a dry place and protect from light. Use the original blister packaging to protect from moisture. Keep away from children.
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