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Telcagepant structure.svg
Clinical data
Routes of
ATC code
  • none
Legal status
Legal status
  • Development terminated
Pharmacokinetic data
Elimination half-life5–8 hours
CAS Number
PubChem CID
Chemical and physical data
Molar mass566.5283 g/mol g·mol−1
3D model (JSmol)
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Telcagepant (INN) (code name MK-0974) is a calcitonin gene-related peptide receptor antagonist which was an investigational drug for the acute treatment and prevention of migraine, developed by Merck & Co..[1]

In the acute treatment of migraine, it was found to have equal potency to rizatriptan[2] and zolmitriptan[3]

A Phase IIa clinical trial studying telcagepant for the prophylaxis of episodic migraine was stopped on March 26, 2009 after the "identification of two patients with significant elevations in serum transaminases".[4] A memo to study locations stated that telcagepant had preliminarily been reported to increase the hepatic liver enzyme alanine transaminase (ALT) levels in "11 out of 660 randomized (double-blinded) study participants." All study participants were told to stop taking the medication.[5]

On July 2011, Merck announced that it had discontinued development of telcagepant.[6]

See also[edit]


  1. ^ Molecule of the Month February 2009
  2. ^ Ho, Tw; Mannix, Lk; Fan, X; Assaid, C; Furtek, C; Jones, Cj; Lines, Cr; Rapoport, Am; Mk-0974, Protocol, 004, Study, Group (Apr 2008). "Randomized controlled trial of an oral CGRP receptor antagonist, MK-0974, in acute treatment of migraine". Neurology. 70 (16): 1304–12. doi:10.1212/01.WNL.0000286940.29755.61. PMID 17914062.CS1 maint: multiple names: authors list (link)
  3. ^ Ho TW, Ferrari MD, Dodick DW, et al. (December 2008). "Efficacy and tolerability of MK-0974 (telcagepant), a new oral antagonist of calcitonin gene-related peptide receptor, compared with zolmitriptan for acute migraine: a randomised, placebo-controlled, parallel-treatment trial". Lancet. 372 (9656): 2115–23. doi:10.1016/S0140-6736(08)61626-8. PMID 19036425.
  4. ^ Clinical trial number NCT00797667 for "MK0974 for Migraine Prophylaxis in Patients With Episodic Migraine" at
  5. ^ Merck & Co.: Memo to all US study locations involved in protocol MK0974-049
  6. ^ "Press release: Merck Announces Second Quarter 2011 Financial Results". Merck. July 29, 2011. Archived from the original on April 12, 2013.