Alpha-adrenergic agonist
Alpha adrenergic agonist | |
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Alpha adrenergic receptors of the α subtype | |
External links | |
MeSH | D000316 |
Legal status | |
In Wikidata |
Alpha-adrenergic agonists are a class of
Classes
Although complete selectivity between receptor agonism is rarely achieved, some agents have partial selectivity. NB: the inclusion of a drug in each category just indicates the activity of the drug at that receptor, not necessarily the selectivity of the drug (unless otherwise noted).
α1 agonist
- Adrenoswitch-1 (photoswitchable partial α1 agonist and light-controlled mydriatic)[1]
- Methoxamine
- Midodrine
- Metaraminol
- Phenylephrine[2]
- Amidephrine[3]
- Sdz-nvi-085 [104195-17-7].
α2 agonist
- Clonidine (mixed alpha2-adrenergic and imidazoline-I1 receptor agonist)
- Dexmedetomidine
- Fadolmidine
- Guanfacine,[4] (preference for alpha2A-subtype of adrenoceptor)
- Guanabenz (most selective agonist for alpha2-adrenergic as opposed to imidazoline-I1)
- Guanoxabenz (metabolite of guanabenz)
- Guanethidine (peripheral alpha2-receptor agonist)
- Xylazine(not for human use),[5]
- Tizanidine
- Methyldopa
- Methylnorepinephrine
- Norepinephrine[6]
- amitraz[9]
- Detomidine[citation needed]
- Lofexidine, an α2A adrenergic receptor agonist.[10]
- Medetomidine, an α2 adrenergic agonist.[11]
Nonspecific agonist
Nonspecific agonists act as agonists at both alpha-1 and alpha-2 receptors.
- Xylometazoline[12]
- Oxymetazoline[13]
- Apraclonidine[citation needed]
- Cirazoline[14][15]
- Epinephrine[16]
Undetermined/unsorted
The following agents are also listed as agonists by MeSH.[17]
- ergotamine
- etilefrine
- indanidine
- mephentermine
- metaraminol
- methoxamine
- mivazerol
- naphazoline
- norfenefrine
- octopamine
- phenylpropanolamine
- propylhexedrine
- rilmenidine
- romifidine
- synephrine
- talipexole
Clinical significance
Alpha-adrenergic agonists, more specifically the auto receptors of alpha 2 neurons, are used in the treatment of glaucoma by decreasing the production of aqueous fluid by the ciliary bodies of the eye and also by increasing uveoscleral outflow. Medications such as clonidine and dexmedetomidine target pre-synaptic auto receptors, therefore leading to an overall decrease in norepinephrine which clinically can cause effects such as sedation, analgesia, lowering of blood pressure and bradycardia. There is also low quality evidence that they can reduce shivering post operatively.[18]
The reduction of the stress response caused by alpha 2 agonists were theorised to be beneficial peri operatively by reducing cardiac complications, however this has shown not to be clinically effective as there was no reduction in cardiac events or mortality but there was an increased incidence of hypotension and bradycardia.[19]
Alpha-2 adrenergic agonists are sometimes prescribed alone or in combination with stimulants to treat ADHD.[20]
See also
References
- ISSN 1433-7851.
- S2CID 8074029.
- PMID 2569342.
- PMID 17173664.
- S2CID 8218673.
- PMID 15283516.
- PMID 17630725.
- PMID 20925410.
- ^ Hsu, W. H. and Lu, Z.-X. (1984). Amitraz' induced delay of gastrointestinal transit in mice: Mediated by α2 adrenergic receptors. Drug Development Research, Volume 4 (6), 655- 680.
- ^ "Press Announcements - FDA approves the first non-opioid treatment for management of opioid withdrawal symptoms in adults". www.fda.gov. Retrieved 18 May 2018.
- PMID 14664351.
- S2CID 25064699.
- ^ Westfall Thomas C, Westfall David P, "Chapter 6. Neurotransmission: The Autonomic and Somatic Motor Nervous Systems" (Chapter). Brunton LL, Lazo JS, Parker KL: Goodman & Gilman's The Pharmacological Basis of Therapeutics, 11e: "AccessMedicine | Anatomy and General Functions of the Autonomic and Somatic Motor Nervous Systems". Archived from the original on 2011-09-30. Retrieved 2015-01-24..
- PMID 8564227.
- PMID 6123592.
- ISBN 978-1-59541-101-3.
- ^ MeSH list of agents 82000316
- PMID 26256531.
- PMID 29509957.
- PMID 35503597.
External links
- Media related to Alpha-adrenergic agonists at Wikimedia Commons
- Adrenergic+alpha-Agonists at the U.S. National Library of Medicine Medical Subject Headings (MeSH)