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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.
[9] [6] Other side effects may include feeling lightheaded with standing due to changes in blood pressure, and angioedema. [9] Tamsulosin is an alpha blocker and works by relaxing muscles in the prostate. [10] Specifically it is an α 1-adrenergic receptor blocker. [6] Tamsulosin was approved for medical use in the United States in 1997. [6]
[3] [5] [1] It is taken by mouth. [3] [1] Side effects of midodrine include hypertension (high blood pressure), paresthesia, itching, goosebumps, chills, urinary urgency, urinary retention, and urinary frequency. [3] Midodrine is a prodrug of its active metabolite desglymidodrine. [3] [1] This metabolite acts as a selective agonist of the α 1 ...
Prazosin is an α 1-blocker that acts as a non-selective inverse agonist at α 1-adrenergic receptors, including of the α 1A-, α 1B-, and α 1D-adrenergic receptor subtypes. [24] It binds to these receptors with affinity (K i ) values of 0.13 to 1.0 nM for the α 1Α -adrenergic receptor, 0.06 to 0.62 nM for the α 1B -adrenergic receptor ...
Many tricyclic antidepressants, tetracyclic antidepressants, antipsychotics, ergolines, and some piperazines like buspirone, trazodone, nefazodone, etoperidone, and mepiprazole antagonize α 1-adrenergic receptors as well, which contributes to their side effects such as orthostatic hypotension.
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.
However, the serotonin receptor antagonism has side effects such as weight gain and impaired movement. [11] Hence, alpha-2 blockers are not used clinically due to its extensive binding. Similar to the alpha-1 blocker, the alpha-2 family will also present the first-dose effect, but it is generally less pronounced compared with the alpha-1 ...
The mechanisms of sympathomimetic drugs can be direct-acting (direct interaction between drug and receptor), such as α-adrenergic agonists, β-adrenergic agonists, and dopaminergic agonists; or indirect-acting (interaction not between drug and receptor), such as MAOIs, COMT inhibitors, release stimulants, and reuptake inhibitors that increase the levels of endogenous catecholamines.