Capsaicin-induced dermal vasodilation in rat, rabbit and monkey; CGRP-induced relaxation of human cranial arteries ex vivo
“In efficacy models, ubrogepant inhibited relaxation of capsaicin-induced dermal vasodilation (a CGRP mediated response) in the rat (EC50=3 nM), rabbit (EC60 20 µM), and monkey (EC50=3 pM), and inhibited of CGRP-induced relaxation of human cranial arteries dose dependently (up to ~25% at 1 µM).”
✓ VerifiedFDA pharmacology/toxicology review, p. 18Source ↗
Why that model
Not stated in public reviews
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reviewer's view of the efficacy data
Characterized as CGRP receptor antagonist across species, with more potent binding and in vivo functional effects in human and rhesus monkey than rodents and rabbit
“The primary pharmacology studies conducted characterize ubrogepant as an antagonist at the mouse, rat, rabbit, rhesus monkey, and human CGRP receptors, with greater in vitro binding affinity and more potent in vivo functional (capsaicin-induced vasodilation) effects in human and rhesus monkey compared to mouse (binding data only), rat, and New Zealand White rabbit.”
✓ VerifiedFDA pharmacology/toxicology review, p. 4Source ↗