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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.
Oxymetazoline, sold under the brand name Afrin among others, is a topical decongestant and vasoconstrictor medication. It is available over-the-counter as a nasal spray to treat nasal congestion and nosebleeds, as eye drops to treat eye redness due to minor irritation, and (in the United States) as a prescription topical cream to treat persistent facial redness due to rosacea in adults.
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 norepinephrine being the highest affinity.
It is used as eye drops or applied to the skin. [4] [5] It is also available in the fixed-dose combination medication brimonidine/timolol along with timolol maleate. [6] Common side effects when used in the eyes include itchiness, redness, and a dry mouth. [4] Common side effects when used on the skin include redness, burning, and headaches. [5]
Xylometazoline is in the decongestant and alpha-adrenergic agonist families of medication. [5] [6] One study classified it with selectivity ratios in alpha 2 adrenergic receptors of 151 for a2A vs a2B, 4.5 a2A vs a2C, and 33.9 a2B vs a2C. Making it a highly selective a2A agonist. [7] Xylometazoline was patented in 1956 and came into medical use ...
Side effects of dipivefrine include local eye reactions among others. Dipivefrine is a prodrug of epinephrine (adrenaline) and hence acts as a non-selective adrenergic receptor agonist . [ 5 ] It is a substituted phenethylamine and catecholamine and is an ester of epinephrine with much greater fat solubility .
Naphazoline is a medicine used as a decongestant, and a vasoconstrictor added to eye drops to relieve red eye. It has a rapid action in reducing swelling when applied to mucous membranes . It is a sympathomimetic agent with marked alpha adrenergic activity that acts on alpha-receptors in the arterioles of the conjunctiva to produce constriction ...
The effects of a systemic overdose will probably be similar to the effects of a nerve agent (they both act on the cholinergic system, increasing cholinergic transmission), but its toxicity is much weaker and it is easier to antagonize in overdose. When administered ocularly there is little risk of such effects, since the doses are much smaller ...