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Rhinitis medicamentosa (or RM, also known as rebound congestion) is a condition of rebound nasal congestion suspected to be brought on by extended use of topical decongestants (e.g., oxymetazoline, phenylephrine, xylometazoline, and naphazoline nasal sprays) and certain oral medications (e.g., sympathomimetic amines and various 2-imidazolines) that constrict blood vessels in the lining of the ...
Phenylephrine is a selective α 1-adrenergic receptor agonist with minimal to no β-adrenergic receptor agonist activity or induction of norepinephrine release. [5] [8] [15] It causes constriction of both arteries and veins. [12] Phenylephrine was patented in 1933 [16] and came into medical use in 1938. [17] It is available as a generic medication.
Phenylephrine is an oral medication primarily used as a decongestant. [5] [6] It is a selective α 1-adrenergic receptor activator which results in the constriction of both arteries and veins. [5] Common side effects include nausea, headache, and anxiety. [5] Phenylephrine was patented in 1927 and came into medical use in 1938. [7]
Like many other over-the-counter ingredients, phenylephrine was essentially grandfathered into approval during a sweeping FDA review begun in 1972. It has been sold in various forms for more than ...
Phenylephrine is the main ingredient used in many common over-the-counter congestion products. It is safe to use, but an independent advisory committee to the FDA agreed Tuesday that it is ...
Pseudoephedrine acts indirectly on the adrenergic receptor system, whereas phenylephrine and oxymetazoline are direct agonists. The effects are not limited to the nose, and these medicines may cause hypertension (high blood pressure) through vasoconstriction; it is for this reason that people with hypertension are advised to avoid them. Most ...
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.
The OTC drug phenylephrine does not work to relieve congestion, an FDA advisory panel said Tuesday. The ingredient is found in a number of cold and allergy pills. FDA panel says common over-the ...