Naratriptan

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Naratriptan
Naratriptan.svg
Naratriptan 3D ball-and-stick.png
Clinical data
Trade names Amerge
AHFS/Drugs.com Monograph
MedlinePlus a601083
Pregnancy
category
  • AU: B3
  • US: C (Risk not ruled out)
Routes of
administration
Oral
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Bioavailability 74%
Metabolism Hepatic
Biological half-life 5-8 hours
Excretion Renal
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
ECHA InfoCard 100.121.501
Chemical and physical data
Formula C17H25N3O2S
Molar mass 335.465 g/mol
3D model (JSmol)
  (verify)

Naratriptan (trade names include Amerge and Naramig) is a triptan drug marketed by GlaxoSmithKline and is used for the treatment of migraine headaches. Naratriptan is available in 2.5 mg tablets. It is a selective 5-HT1 receptor subtype agonist.

Indication[edit]

Naratriptan is used for the treatment of the acute migraine attacks and the symptoms of migraine, including severe, throbbing headaches that sometimes are accompanied by nausea and sensitivity to sound or light.[1]

Mechanism of action[edit]

The causes of migraine are not clearly understood; however, the efficacy of naratriptans and other triptans is believed to be due to their activity as 5HT (serotonin) agonists.

Efficacy[edit]

A meta-analysis of 53 clinical trials has shown that all triptans are effective for treating migraine at marketed doses and that naratriptan, although less effective than sumatriptan and rizatriptan was more effective than placebo in reducing migraine symptoms at two hours[2] and efficacy was demonstrated in almost two thirds of subjects after four hours of treatment.[3]

Side effects[edit]

Side effects include: dizziness, drowsiness, tingling of the hands or feet, nausea, dry mouth and unsteadiness. If these effects persist or worsen, notify your doctor promptly. Side-effects which are unlikely and which should be promptly reported include: chest pain/pressure, throat pain/pressure, unusually fast/slow/irregular pulse, one-sided muscle weakness, vision problems, cold/bluish hands or feet, stomach pain, bloody diarrhea, mental/mood changes, and fainting. In the unlikely event you have a serious allergic reaction to this drug, seek immediate medical attention. Symptoms of a serious allergic reaction include: rash, itching, swelling, severe dizziness, trouble breathing (swelling of the throat).

Exclusivity[edit]

In the United States, the Food and Drug Administration (FDA) approved naratriptan on February 11, 1998.[4] It was covered by U.S. Patent no. 4997841; the FDA lists the patent as expiring on July 7, 2010.[4][5]

In July 2010, in the wake of the patent expiration, several drug manufacturers, including Roxane Labs,[6] Sandoz[7] and Teva Pharmaceuticals,[8] announced that they were launching generic Naratriptan medications.

The drug continued to be covered by European patent 0303507 in Germany, Spain, France and the United Kingdom through March 10, 2012,[9] and by Australian patent 611469 in Australia through June 17, 2013.[9] It had previously been covered by Canadian patent 1210968; but both Sandoz and Teva (formerly Novopharm) have offered generic equivalents in Canada since that patent's expiration December 1, 2009.[9]

In December 23, 2014, in response to a request from Health Canada, importers in Canada agreed to quarantine the importation of health products, including generic Naratriptan manufactured for both Sandoz and Teva, from Dr. Reddy's Laboratories in Srikakulam, India.[10][11] Because Teva and Sandoz are the only approved suppliers of generic Naratriptan in Canada, the quarantine resulted in Naratriptan being placed on the Canadian drug shortage list.[12]

Following the Canadian quarantine, the United Arab Emirates' Ministry of Health also imposed a similar quarantine.[12][13]

References[edit]

  1. ^ Medline Plus Drug Information for Naratriptan Accessed 6 August 2009
  2. ^ Triptans (serotonin, 5-HT1B/1D agonists) in migraine: detailed results and methods of a meta-analysis of 53 trials. Cephalalgia 2002 Oct;22(8):633-58.
  3. ^ Efficacy of naratriptan tablets in the acute treatment of migraine: A dose-ranging study. Clin Ther 2000 Aug;22(8):970-80.
  4. ^ a b FDA AccessData entry for Naratriptan Hydrochloride, accessed September 8, 2008
  5. ^ U.S. Patent no. 4997841, Alexander W. Oxford, et al., Indole Derivatives, March 5, 1991
  6. ^ DeArment, Alaric (2010-07-09). "Roxane launches generic Amerge, Arimidex". Drug Store News. Retrieved 2010-07-23. 
  7. ^ DeArment, Alaric (2010-07-12). "Sandoz launches generic Amerge". Drug Store News. Retrieved 2010-07-23. 
  8. ^ DeArment, Alaric (2010-07-14). "Teva launches generic Amerge". Drug Store News. Retrieved 2010-07-23. 
  9. ^ a b c Oh, Dae (June 2010). "Drug In Focus: Naratriptan". GenericsWeb. Retrieved 2010-12-15. 
  10. ^ "Health products quarantined from two India sites". Health Canada. Government of Canada. December 24, 2014. Retrieved September 14, 2017. 
  11. ^ "Health products quarantined from two sites in India as Health Canada assesses data integrity concerns". Recalls and safety alerts. Health Canada. December 23, 2014. Retrieved September 14, 2017. 
  12. ^ a b "Dr. Reddy's largest API Facility Maybe the Next to Get Banned from Exporting to the United States". PharmaCompass. March 30, 2015. Retrieved September 14, 2017. 
  13. ^ "Circular no. HRD/017/15: Stop the importation and distribution of Medical Products manufactured by Dr. Reddy's Laboratories in Srikakulam, India & IPCA Laboratories in Pithampur". Health Authority – Abu Dhabi (HAAD). United Arab Emirates Ministry of Health. February 19, 2015. Retrieved September 14, 2017.