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Alpha blockers work by blocking the effect of nerves in the sympathetic nervous system. This is done by binding to the alpha receptors in smooth muscle or blood vessels. [37] α-blockers can bind both reversibly and irreversibly. [2] There are several α receptors throughout the body where these drugs can bind.
Those that block beta-2-adrenergic receptors reduce blood pressure through increased relaxation of smooth muscle. [33] Alpha-blockers can block alpha-1 adrenergic receptors and/or alpha-2 adrenergic receptors. [34] Those that block alpha-1-adrenergic receptors on vascular smooth muscle cells prevent vasoconstriction. [34]
As alpha 1 blocker will dilate blood vessels, it lowers the blood pressure. [3] Thus, it contraindicate to patients with a history of orthostatic hypotension and in current use of phosphodiesterase inhibitors. [3] Moreover, alpha 1 blocker should not be given to patients with heart failure since it expands blood volume. [13]
Prazosin, sold under the brand name Minipress among others, is a medication used to treat high blood pressure, symptoms of an enlarged prostate, and nightmares related to post-traumatic stress disorder (PTSD). [6] It is an α 1 blocker. [6] It is a less preferred treatment of high blood pressure. [6] Other uses may include heart failure and ...
Alpha-blockers, which prevent nerve signals from causing blood vessel constriction. When To Take Blood Pressure Medication To Lower Heart Attack Risk, According to Cardiologists
First generation alpha-1 blockers, like prazosin are not recommended to treat lower urinary tract symptoms because of their blood-pressure-lowering effect. Later generation drugs in this class are used for this purpose. [1] [9] In some cases alpha-1 blockers have been used in combined therapy with 5-alpha reductase blockers.