Notes: Betaxolol-d7 is intended for use as an internal standard for the quantification of betaxolol (Item No. 18625) by GC- or LC-MS. Betaxolol is an antagonist of the β1-adrenergic receptor (β1-AR; Ki = 23 nM).{39508} It is selective for the β1-AR over the β2-AR (Ki = 790 nM). Betaxolol is cytotoxic to 10.014 pRSV-T human corneal epithelial cells.{30089} It reduces intraocular pressure in cynomolgus monkeys with ocular hypertension induced by laser trabeculoplasty when administered at a dose of 150 µg/animal.{58318} Betaxolol also inhibits sodium influx induced by the neurotoxin veratridine in rat cortical synaptosomes (IC50 = 28.3 µM).{30086}