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a hormone produced by the adrenal medulla; called also adrenaline (British). Its function is to aid in the regulation of the sympathetic branch of the autonomic nervous system. At times when a person is highly stimulated, as by fear, anger, or some challenging situation, extra amounts of epinephrine are released into the bloodstream, preparing the body for energetic action. Epinephrine is a powerful vasopressor that increases blood pressure and increases the heart rate and cardiac output. It also increases glycogenolysis and the release of glucose from the liver, so that a person has a suddenly increased feeling of muscular strength and aggressiveness.ƒ

Some disorders of the adrenal glands, such as addison's disease, reduce the output of epinephrine below normal. By contrast, excessive activity of those glands, as sometimes seen in highly emotional persons, tends to produce tenseness, palpitation, high blood pressure, perhaps diarrhea, and overaggressiveness. Certain adrenal tumors also result in the production of too much epinephrine. Removal of the tumor relieves symptoms.

Epinephrine is also produced synthetically and can be administered parenterally, topically, or by inhalation. It acts as a vasoconstrictor, antispasmodic, and sympathomimetic, and it is used as an emergency heart stimulant as well as to relieve symptoms in allergic conditions such as urticaria (hives), asthma, and other conditions requiring bronchodilation and as a adjunct to local and regional anesthesia. It is the most effective drug for counteracting the lethal effects of anaphylactic shock. It is also used topically in the eye in the treatment of glaucoma.


/Adren·a·lin/ (ah-dren´ah-lin) trademark for preparations of epinephrine.


A trademark for a preparation of epinephrine.


a trademark for an adrenergic (epINEPHrine).

Adrenalin (ədren´əlin),

n the brand name for epinephrine. See also epinephrine.
References in periodicals archive ?
Krishna G V Giri, Chairman & CEO of Adrenalin eSystems says, "The world of HR is Changing.
He further added that Adrenalin has closed its books with positive bottom-line and he was confident of doubling the top-line & bottom-line during the second half of the fiscal year.
Adrenalin also issued a bullish forecast for coming quarters of the current fiscal year given its strong business pipeline in countries like Philippines, and future plans are to expand to markets like Australia, China and Japan with Adrenalin's dedicated offices in APAC region to provide strong push in expanding the regions and numbers.
The Cloud Adrenalin pay-as-you-grow model allows providers to dynamically control spending in response to the elastic requirements for content, subscribers and levels of service offering.
The Oman government hopes to attract over $12 billion in foreign investment over the next couple of decades and the potential market for tools like the Adrenalin HRMS would be around 5-10% of overall annual software consumption and planned budgetary allocations.
SeaChange will feature multi-screen consumer experiences enabled by Adrenalin and Nitro at the 2013 International Consumer Electronics Show, Jan.
SeaChange's Adrenalin provides the back office systems to support seamless content to TV and online devices.
The SeaChange Cloud Adrenalin service features the SeaChange Nitro subscriber experience software.
Indrakumar, Head-HR, NTrush Infotech, an Adrenalin client, gave a crisp presentation on 'Adrenalin Advantage'.
Operators will use Adrenalin to evolve their on-demand services to provide rich and seamless user experiences across mobile, PC and TV screens with extensive cross promotional capabilities and fully integrated linear and non-linear advertising.
A common statistic is one hour of sleep per 24 hours of racing," said Gary Tompsett, an adventure racer from Scotland who helped organize the Adrenalin Rush.
Adrenalin peaks in midafternoon, then sinks to its nadir 12 hours later, so that airway function is best in midafternoon and worst at 4 a.