Substance P, a neuropeptide with endogenous ligand property for NK1 receptors
NK1 antagonists were shown to be effective against emesis induced by a variety of emetogens
Development of NK1 antagonists as antiemesis, started with peptidomimetics in 1980’s
Nonpeptide NK1 antagonists started in 1990’s, Pfizer CP-96345 is the first lead compound
Modification of CP-96345 to increase receptor affinity and metabolic stability
In 2000’s, Aprepitant is the first in class of NK1 antagonists entered into clinical studies