Alpha receptor agonists are substances that activate the sympathetic nervous system by stimulation of alpha receptors, similar to the effects of epinephrine and norepinephrine. Alpha receptors are ...

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 ...

Serotonin-norepinephrine reuptake inhibitors (SNRIs) are a class of antidepressants that block the reuptake of both serotonin and norepinephrine in the body. They are taken to treat depression ...