Pronunciation: [jˈuːmɪdɹˌiːn] (IPA) 
Eumydrine, pronounced [yu.my.draɪn], is a medication used to relieve symptoms of nausea and vomiting. Its spelling can be broken down phonetically as follows: "eu" [yu] indicates a "y" sound; "my" [maɪ] represents a long "i" sound; "drine" [draɪn] includes a long "i" sound as well as a "d" and "r" sound. Overall, eumydrine is an effective remedy for those experiencing discomfort due to sickness or motion sickness.
Eumydrine is a pharmaceutical drug that belongs to the class of sympathomimetic agents, specifically an alpha-adrenergic agonist. It is used primarily as a nasal decongestant and is commonly sold over-the-counter in the form of nasal sprays or drops. Eumydrine works by constricting the blood vessels in the nasal passages, which helps to reduce swelling and congestion, thus enabling easier breathing.
The main active ingredient in eumydrine is naphazoline hydrochloride, a compound that stimulates alpha-adrenergic receptors in the smooth muscle tissues of the blood vessels in the nasal mucosa. This stimulation causes vasoconstriction, or narrowing of the blood vessels, which subsequently reduces blood flow and inflammation in the nasal passages. As a result, the nasal congestion is relieved, allowing for improved nasal airflow.
Eumydrine is typically recommended for the temporary relief of nasal congestion caused by respiratory allergies, hay fever, or the common cold. However, it should be used with caution and not for a prolonged period, as excessive or prolonged use may lead to a condition known as rebound congestion or rhinitis medicamentosa, wherein the nasal passages become even more congested after discontinuation of the medication.
In summary, eumydrine is a nasal decongestant medication that contains naphazoline hydrochloride as its active ingredient. It effectively reduces nasal congestion by constricting blood vessels in the nasal mucosa, providing temporary relief from common respiratory conditions such as allergies or colds.
Trade name of methylatropine nitrate, C17H22(CH3)NO3, HNO3; a white soluble crystalline salt, employed as a mydriatic in 1 or 2 per cent. solution, and given internally to control the night-sweats of phthisis in doses of gr. 1/60-1/24 (0.001-0.0025).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
