Oxprenolol is an orally bioavailable β-adrenergic receptor (β-AR) antagonist (Ki = 7.10 nM in a radioligand binding assay using rat heart tissue). It is non-selective and inhibits both β1- and β2-ARs (Kds = 2.09 and 1.35 nM in isolated rat heart and uterus, respectively). Oxprenolol is selective for β-ARs over serotonin (5-HT) receptors in rat sarcolemmal membrane preparations (IC50s = 4.13 and 23,300 nM, respectively), but it binds to 5-HT1A receptors in rat hippocampus and 5-HT1B in rat striatum (Kis = 94.2 and 642 nM, respectively).
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