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However, because there are several structural compositions that make each alpha blocker different, the side effects are different for each drug. Side effects that arise when taking alpha blockers can include the first dose effect, cardiovascular side effects, genitourinary side effects, as well as other side effects. [28]
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 ...
Alpha-1 blockers (also called alpha-adrenergic blocking agents or alpha-1 antagonists) constitute a variety of drugs that block the effect of catecholamines on alpha-1-adrenergic receptors. They are mainly used to treat benign prostatic hyperplasia (BPH), hypertension and post-traumatic stress disorder . [ 1 ]
[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]
Adrenergic neurone blockers, commonly known as adrenergic antagonists, are a group of drugs that inhibit the sympathetic nervous system by blocking the activity of adrenergic neurones. They prevent the action or release of catecholamines such as norepinephrine and epinephrine.
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 ...
Clonidine, sold under the brand name Catapres among others, is an α 2A-adrenergic receptor agonist [12] medication used to treat high blood pressure, ADHD, drug withdrawal (e.g., alcohol, opioids, or nicotine), menopausal flushing, diarrhea, spasticity, and certain pain conditions. [13]
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.