Marmoset hCGRP-induced facial blood flow: 75-80% inhibition (target engagement in normal animals)
“Rimegepant effectively antagonised the hCGRP-induced increases in marmoset facial blood flow showing 75% to 80% inhibition at plasma levels of ~700 nM (or 374 ng/mL).”
Human-like CGRP receptor affinity only in primates; >1,300-fold lower activity at dog, rat and mouse receptors
“Comparing activity across species, rimegepant exhibits similar receptor affinities at both human (Ki of 33 pM) and nonhuman primate (marmoset (92 pM) and cynomolgus monkey (60 pM)) CGRP receptors, with more than 1,300-fold less activity at dog (43 nM), rat (209 nM) and mouse (104 nM) CGRP receptors as compared to human.”