Eletriptan Hydrobromide (2 brand names, 1 dosage form, 1 route)
Available dosage forms: TABLET.
Routes of administration: ORAL.
Brand Names
- ELETRIPTAN HYDROBROMIDE
- RELPAX
Indications and Usage
Eletriptan Hydrobromide Tablets is indicated for the acute treatment of migraine with or without aura in adults.
Dosage and Administration
The maximum recommended single dose is 40 mg. In controlled clinical trials, single doses of 20 mg and 40 mg were effective for the acute treatment of migraine in adults. A greater proportion of patients had a response following a 40 mg dose than following a 20 mg dose [see Clinical Studies (14)]. If the migraine has not resolved by 2 hours after taking Eletriptan Hydrobromide Tablets, or returns after transient improvement, a second dose may be administered at least 2 hours after the first dose. The maximum daily dose should not exceed 80 mg. The safety of treating an average of more than 3 migraine attacks in a 30-day period has not been established.
Contraindications
Eletriptan Hydrobromide Tablets is contraindicated in patients with: Ischemic coronary artery disease (CAD) (angina pectoris, history of myocardial infarction, or documented silent ischemia) or coronary artery vasospasm, including Prinzmetal’s angina [see Warnings and Precautions (5.1)]. Wolff-Parkinson-White syndrome or arrhythmias associated with other cardiac accessory conduction pathway disorders [see Warnings and Precautions (5.2)]. History of stroke, transient ischemic attack (TIA), or history or current evidence of hemiplegic or basilar migraine because these patients are at a higher risk of stroke [see Warnings and Precautions (5.4)]. Peripheral vascular disease [see Warnings and Precautions (5.5)]. Ischemic bowel disease [see Warnings and Precautions (5.5)]. Uncontrolled hypertension [see Warnings and Precautions (5.8)]. Recent use (i.e., within 24 hours) of another 5-hydroxytryptamine1 (5-HT1) agonist, ergotamine-containing medication, or ergot-type medication such as dihydroergotamine (DHE) or methysergide [see Drug Interactions (7.1)]. Hypersensitivity to Eletriptan Hydrobromide Tablets (angioedema and anaphylaxis seen) [see Warnings and Precautions (5.9)]. Recent use (i.e., within at least 72 hours) of the following potent CYP3A4 inhibitors: ketoconazole, itraconazole, nefazodone, troleandomycin, clarithromycin, ritonavir, or nelfinavir [see Drug Interactions (7.2) and Clinical Pharmacology (12.3)].
Warnings and Precautions
Eletriptan Hydrobromide Tablets should only be used where a clear diagnosis of migraine has been established.
Adverse Reactions
The following adverse reactions are described elsewhere in other sections of the prescribing information: Myocardial ischemia and myocardial infarction, and Prinzmetal’s angina [see Warnings and Precautions (5.2)] Arrhythmias [see Warnings and Precautions (5.3)] Chest, throat, neck, and/or jaw pain/tightness/pressure [see Warnings and Precautions (5.4)] Cerebrovascular events [see Warnings and Precautions (5.4)] Other vasospasm reactions [see Warnings and Precautions (5.5)] Medication overuse headache [see Warnings and Precautions (5.6)] Serotonin syndrome [see Warnings and Precautions (5.7)] Increase in blood pressure [see Warnings and Precautions (5.8)] Hypersensitivity reactions [see Contraindications (4) and Warnings and Precautions (5.9)]
Mechanism of Action
Eletriptan binds with high affinity to 5-HT1B, 5-HT1D and 5-HT1F receptors, has modest affinity for 5-HT1A, 5-HT1E, 5-HT2B and 5-HT7 receptors. Migraines are likely due to local cranial vasodilatation and/or to the release of sensory neuropeptides (vasoactive intestinal peptide, substance P and calcitonin gene-related peptide) through nerve endings in the trigeminal system. The therapeutic activity of Eletriptan Hydrobromide Tablets for the treatment of migraine headache is thought to be due to the agonist effects at the 5-HT1B/1D receptors on intracranial blood vessels (including the arterio-venous anastomoses) and sensory nerves of the trigeminal system which result in cranial vessel constriction and inhibition of pro-inflammatory neuropeptide release.
Overdosage
The elimination half-life of eletriptan is about 4 hours [see Clinical Pharmacology (12.3)], therefore monitoring of patients after overdose with eletriptan should continue for at least 20 hours or longer while symptoms or signs persist. There is no specific antidote to eletriptan. It is unknown what effect hemodialysis or peritoneal dialysis has on the serum concentration of eletriptan.