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When/how is clonodine used as treatment for high blood pressure?

Was recently treated for hypertensive crisis.

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Clonidine is a centrally-acting α-adrenergic receptor agonist with more affinity for α2 than α1. It works by stimulating α2 receptors in the brain which decreases cardiac output and peripheral vascular resistance, lowering blood pressure. It has specificity towards the presynaptic alpha-2 receptors in the vasomotor center in the brainstem. This binding decreases presynaptic calcium levels, and inhibits the release of norepinephrine (NE). The net effect is a decrease in sympathetic tone.

It selectively stimulates receptors in the brain that monitor catecholamine levels in the blood. These receptors close a negative feedback loop that begins with descending sympathetic nerves from the brain that control the production of catecholamines (epinephrine, also known as adrenaline, and norepinephrine) in the adrenal medulla. By fooling the brain into believing that catecholamine levels are higher than they really are, clonidine causes the brain to reduce its signals to the adrenal medulla, which in turn lowers catecholamine production and blood levels. The result is a lowered heart rate and blood pressure, with side effects of dry mouth and fatigue. If clonidine is suddenly withdrawn the sympathetic nervous system will revert to producing high levels of epinephrine and norepinephrine, higher even than before treatment, causing rebound hypertension. Rebound hypertension can be avoided by slowly withdrawing treatment.

Yeah... it's technical, but you DID ask XD
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