|Systematic (IUPAC) name|
|Half life||5-8 hours|
Telcagepant (formerly MK-0974) is an investigational drug for the acute treatment and prevention of migraine, developed by Merck & Co. In the acute treatment of migraine, it was found to have equal potency to rizatriptan and zolmitriptan in two Phase III clinical trials.
The calcitonin gene-related peptide (CGRP) is a strong vasodilator primarily found in nervous tissue. Since vasodilation in the brain is thought to be involved in the development of migraine and CGRP levels are increased during migraine attacks, this peptide may be an important target for potential new antimigraine drugs.
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". A memo to study locations stated that telcagepant had preliminarily been reported to increase the hepatic liver enzyme alanine transaminase (AST) levels in "11 out of 660 randomized (double-blinded) study participants." All study participants were told to stop taking the medication.