(R)-Propranolol hydrochloride 

(R)-Propranolol hydrochloride is a less active enantiomer of the β-adrenoceptor antagonist propranolol (HY-B0573). Propranolol is a nonselective β-adrenergic receptor (βAR) antagonist, has high affinity for the β₁AR and β₂AR with K_i values of 1.8 nM and 0.8 nM, respectively^[1].

Both isomers of propranolol are capable of preventing adrenaline-induced cardiac arrhythmias in cats anaesthetized with halothane, but the mean dose of (-)-propranolol is 0.09 mg/kg whereas that of (+)-propranolol is 4.2 mg/kg^[1].
Both isomers of propranolol are capable of reversing ventricular tachycardia caused by ouabain in anaesthetized cats and dogs. The dose of (-)-propranolol is significantly smaller than that of (+)-propranolol ((R)-Propranolol) in both species^[1].
(R)-Propranolol hydrochloride (10 mg/kg) has no antagonistic activity in rats, the cardiac responses to isoprenaline of rat can be blocked by probably much less than 1/100th of that of the (-) isomer in this preparation^[1].

MCE has not independently confirmed the accuracy of these methods. They are for reference only.

295.80

Solid

C₁₆H₂₂ClNO₂

13071-11-9

O[[email protected]@H](COC1=C2C=CC=CC2=CC=C1)CNC(C)C.[H]Cl

Room temperature in continental US; may vary elsewhere.

4°C, sealed storage, away from moisture

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture)

• [1]. A M Barrett,et al. The biological properties of the optical isomers of propranolol and their effects on cardiac arrhythmias. Br J Pharmacol  [Content Brief]