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As of 2018, prazosin is the only alpha-1 blocker known to act as an inverse agonist at all alpha-1 adrenergic receptor subtypes; [3] [4] whereas tamsulosin is a selective antagonist for all alpha-1 subtypes. [3] [5] Drugs that act as selective antagonists at specific alpha-1 adrenergic receptor subtypes have also been developed.
Alpha-adrenergic agonist. Alpha-adrenergic agonists are a class of sympathomimetic agents that selectively stimulates alpha adrenergic receptors. The alpha-adrenergic receptor has two subclasses α 1 and α 2. Alpha 2 receptors are associated with sympatholytic properties. Alpha-adrenergic agonists have the opposite function of alpha blockers.
Adrenergic agonist. An adrenergic agonist is a drug that stimulates a response from the adrenergic receptors. The five main categories of adrenergic receptors are: α 1, α 2, β 1, β 2, and β 3, although there are more subtypes, and agonists vary in specificity between these receptors, and may be classified respectively.
Tamsulosin is a selective α 1 receptor antagonist that has preferential selectivity for the α 1A receptor in the prostate versus the α 1B receptor in the blood vessels. [25] When alpha 1 receptors in the bladder neck, prostate, ureter, and urethra are blocked, a relaxation in smooth muscle tissue results. [16]
Adrenergic blocking agent. Adrenergic blocking agents are a class of drugs that exhibit its pharmacological action through inhibiting the action of the sympathetic nervous system [1] in the body. The sympathetic nervous system (SNS) is an autonomic nervous system that we cannot control by will. It triggers a series of responses after the body ...
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.
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