Blockade of the beta adrenergic receptors.
D006801:Humans; D009638:Norepinephrine / Q000494:pharmacology*; D011943:Receptors, Adrenergic, beta; D013566:Sympathomimetics / Q000494:pharmacology*
D011943:Receptors, Adrenergic, beta; D013566:Sympathomimetics; D009638:Norepinephrine
NOREPINEPHRINE/pharmacology; SYMPATHOMIMETICS/pharmacology