Translations:Antihypertensive drug/25/en
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Alpha-2 adrenergic receptor agonists
Central alpha agonists lower blood pressure by stimulating alpha-receptors in the brain which open peripheral arteries easing blood flow. These alpha 2 receptors are known as autoreceptors which provide negative feedback in neurotransmission (in this case, the vasoconstriction effects of adrenaline). Central alpha agonists, such as clonidine, are usually prescribed when all other anti-hypertensive medications have failed. For treating hypertension, these drugs are usually administered in combination with a diuretic.