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Systemic Effects of Beta-Blockers

Beta-fish with System Blocks
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Beta blockers have numerous systemic effects. β blockers such as timolol and betaxolol are used in the eye, as they reduce intraocular pressure by decreasing aqueous humor production. A respiratory side effect of beta blocker use is the possibility of causing bronchoconstriction. There are metabolic effects of beta blockers as well, such as decreasing insulin secretion by the pancreas. Furthermore, beta blockers decrease glycolysis and lipolysis, reducing blood glucose. Diabetic patients should be aware of their blood sugar, as beta blockers may mask the usual signs of hypoglycemia.
7 KEY FACTS
Respiratory
Lungs

The lungs have beta 2 receptors and typically bronchodilate when adrenoreceptors are activated. However, when beta blocker drugs are used, bronchoconstriction occurs.

Bronchoconstriction
Broccoli-constrictor

By blocking beta 2 adrenoreceptor activity, beta blocking medications lead to bronchoconstriction in patients. Typically, beta 2 adrenoreceptor activation leads to bronchodilation.

Metabolic
Metal-ball

Adrenergic receptors influence the metabolic system; Beta 3 receptors lead to increased lipolysis, while Beta 2 activation leads to increased insulin release. Thus, beta blocking drugs work to decrease lipolysis and insulin release. In diabetic patients taking insulin, beta blockers block the usual symptoms of hypoglycemia and patients should be aware of their blood glucose.

Decreased Insulin
Down-arrow Insect-syringe

By blocking beta 2 adrenergic receptors, beta blocking medications decrease insulin release from the pancreas.

Decreased Glycolysis and Lipolysis
Down-arrow Glue-laser and Lip-lights

Beta blockers block glycolysis (via decreased glucagon release) and decrease lipolysis. Furthermore, glycogenolysis is also decreased.

Eye
Eye

The ciliary epithelium contains beta adrenergic receptors and ligand binding (epinephrine and norepinephrine) stimulates the formation of aqueous humor. Thus beta blockers decrease aqueous humor formation.

Reduces Intraocular Pressure
Down-arrow Draining-eye

Beta blockers such as timolol and betaxolol decrease aqueous humor formation by blocking beta adrenergic receptors on the ciliary bodies.

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