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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 drug is often prescribed off-label for tics.
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. Alpha adrenoreceptor ligands mimic the action of epinephrine and norepinephrine signaling in the heart, smooth muscle and central nervous system, with
Tizanidine, sold under the brand name Zanaflex among others, is an alpha-2 (α 2) adrenergic receptor agonist, [2] similar to clonidine, that is used to treat muscle spasticity due to spinal cord injury, multiple sclerosis, and spastic cerebral palsy. [3] Effectiveness appears similar to baclofen or diazepam. [4] It is taken by mouth. [5]
In non-human species this is an immobilizing and anesthetic drug, presumptively also mediated by α 2 adrenergic receptors because it is reversed by yohimbine, an α 2 antagonist. α 2A selective agonists include guanfacine (an antihypertensive) and brimonidine (UK 14,304). -3-nitrobiphenyline is an α 2C selective agonist as well as being a ...
Guanfacine, sold under the brand name Tenex (immediate-release) and Intuniv (extended-release) among others, is an oral alpha-2a agonist medication used to treat attention deficit hyperactivity disorder (ADHD) and high blood pressure. [3] [10] Common side effects include sleepiness, constipation, and dry mouth. [10]
[23] [3] When xylazine and other α 2-adrenergic receptor agonists are administered, they distribute throughout the body within 30 to 40 minutes. [17] Due to xylazine's highly lipophilic nature, it directly stimulates central α 2-adrenergic receptors as well as peripheral α-adrenergic receptors in a variety of tissues.
While it is not the only solution, medication can help, including prostaglandins, beta blockers, alpha-adrenergic agonists, carbonic anhydrase inhibitors, rho kinase inhibitors, and miotic or ...
Dexmedetomidine is a highly selective α 2-adrenergic receptor agonist. It possesses an α 2:α 1 selectivity ratio of 1620:1, making it 8 times more selective for the α 2-adrenergic receptor than the related drug clonidine.
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