Enantiomers of propranolol and bupranolol were compared for antinociception.
S-Bupranolol is a superior antinoceptive agent on mouse models of persistent pain.
S-Bupranolol exhibited fewer side effects than propranolol or associated enantiomers.
S-Bupranolol produced a unique blockade of β3-adrenergic receptors.