An adrenergic<unk><unk>  is a drug which selectively stimulates<unk>  adrenergic receptors. The<unk> -adrenergic receptor has two subclasses α1 and α2. Although complete selectivity between receptor<unk>  is rarely achieved, phenylephrine is an α1<unk> , while clonidine and methyldopa are α2 partial<unk> s .
An example is xylazine.<unk> s are used in the treatment of glaucoma by decreasing the production of aqueous fluid by the ciliary bodies of the eye.
Alpha-adrenergic agonist
Beta-adrenergic agonist
Adrenergic agonist
Muscarinic agonist
Dopamine agonist
Muscarinic antagonist
Serotonin antagonist
Dopamine antagonist