Ifenprodil
Ifenprodil is an inhibitor of the NMDA receptor, specifically the GluN1(Glycine-binding NMDA receptor subunit 1) and GluN2B(glutamate-binding NMDA receptor subunit 2) subunits. Ifenprodil inhibits the GIRK channel and interacts with alpha1 adrenergic, serotonin, and sigma receptors.