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Alpha blockers, also known as α-blockers or α-adrenoreceptor antagonists, are a class of pharmacological agents that act as antagonists on α-adrenergic receptors (α-adrenoceptors). [2] Historically, alpha-blockers were used as a tool for pharmacologic research to develop a greater understanding of the autonomic nervous system.
Alpha-1 blocker, blocks alpha receptors and it relaxes the smooth muscles in the bladder. It helps the urine to flow smoothly and it can lessen the pain caused by the bladder pressing on the prostate. [44] [45] Selective alpha-1 blockers are better tolerated than non-selective alpha blockers in the body and therefore works better on BPH. [2]
Heart failure may be worsened with nondihydropyridine calcium channel blockers, the alpha blocker doxazosin, and the alpha-2 agonists moxonidine and clonidine. On the other hand, β-blockers, diuretics, ACEis, ARBs, and aldosterone receptor antagonists have been shown to improve outcome. [67] Pregnancy. Although α-methyldopa is generally ...
Beta-blockers can lower your heart rate and help your heart not work so hard. You might be prescribed a combined alpha- and beta-blocker. Alpha-2 receptor agonists.
Labetalol is a beta blocker, or an antagonist of the β-adrenergic receptors. It is specifically a non-selective antagonist of the β 1-and β 2-adrenergic receptors. [17] Labetalol has intrinsic sympathomimetic activity. [17] It is also an antagonist of the α 1-adrenergic receptor, and hence is additionally an alpha blocker.
It was the first alpha blocker which was used for treating Benign Prostatic Hyperplasia. [22] Another Alpha Blocker Prazosin, which was the first drug selective to alpha 1 receptor, was developed in 1987 [22] for the therapy of Benign Prostatic Hyperplasia. Other alpha blockers are then introduced for several diseases. [22]
When non-selective alpha blockers are used, norepinephrine cannot bind to alpha 1 or alpha 2 receptors. [7] As a result, activation of beta receptors occurs upon norepinephrine binding due to the spillover of excessive amounts of norepinephrine , resulting in tremors and tachycardia .
[2] [10] When used by people with liver problems, and in elderly individuals, doses should be reduced. [10] Amlodipine works partly by vasodilation (relaxing the arteries and increasing their diameter). [10] It is a long-acting calcium channel blocker of the dihydropyridine type. [10] Amlodipine was patented in 1982, and approved for medical ...