Epinephrine
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Beta Blockers
Beta-blockers antagonize beta-1 and beta-2 receptors which are the usual targets of the sympathetic nervous system, including epinephrine and norepinephrine.
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Alpha Agonists
Alpha receptor agonists are substances that activate the sympathetic nervous system by stimulation of alpha receptors, similar to the effects of epinephrine and norepinephrine.
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Epinephrine
Epinephrine (adrenaline) is a hormone that is mediated predominantly through the sympathetic nervous system and acts by stimulating alpha and beta receptors.