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Ifenprodil is a selective antagonist of NMDA receptors that contain NR2B subunits (IC50 = 0.3 µM) and displays 150-fold weaker activity at those bearing NR2C or NR2D subunits.[1] Ifenprodil also acts as a potent ligand at receptors for σ1, emopamil binding proteins, and their σ-like, fungal counterpart ERG2 (Kis = 2, 5, and 1 nM).[2] This compound has been described as an α-adrenergic vasodilator, but is also reported to constrict cerebrovascular smooth muscle in vitro (EC50 = 2.4 µM).[3]

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