An adrenergic alpha-agonist is a drug which selectively stimulates alpha adrenergic receptors. The alpha-adrenergic receptor has two subclasses α₁ and α₂. Although complete selectivity between receptor agonism is rarely achieved, phenylephrine is an α₁ agonist, while clonidine and methyldopa are α₂ partial agonists ^[1].

An example is xylazine.

Alpha-adrenergic agonists are used in the treatment of glaucoma by decreasing the production of aqueous fluid by the ciliary bodies of the eye.

• Adrenergic+alpha-Agonists at the US National Library of Medicine Medical Subject Headings (MeSH)
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Template:Receptor agonists and antagonists

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