Beta-blockers antagonize beta-1 and beta-2 receptors which are the usual targets of the sympathetic nervous system, including epinephrine and norepinephrine. This results in a decreased heart rate ...

“There are beta 1 receptors on the heart and beta 2 receptors on the lungs,” she says. “When it comes to the receptors on the heart, when beta blockers bind to these receptors, they’re ...