Ritanserin (R 55667) is a highly potent, relatively selective, long acting antagonist of 5-HT2 receptor, with an IC50 of 0.9 nM, less active on Histamine-H1 (IC50, 35 nM), Dopamine-D2 (IC50, 70 nM), Adrenergic-α1 (IC50, 97 nM), Adrenergic-α2 receptor (IC50, 150 nM).
Medlife has not independently confirmed the accuracy of these methods. They are for reference only.