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  1. Jan 2021
    1. IC50 values for histamine-H1, dopamine-D2, and adrenergic-alpha 1 and -alpha 2 sites were 39-, 77-, 107-, and 166-fold higher

      Thus, ritanserin is highly selective for 5HT2 receptors. By comparison, ketanserin antagonizes.adrenergic alpha 1 in addition to serotonin receptors.