Ephedrine

Ephedrine is a sympathomimetic alkaloid that increases adrenergic activity. It has been used as a nasal decongestant and to treat low blood pressure, especially during anesthesia.

Adrenergic receptor: A cell-surface receptor activated by norepinephrine or epinephrine to regulate sympathetic responses. Ephedrine directly activates these receptors, producing effects such as vasoconstriction and increased cardiac activity.
Anesthesia-induced hypotension: A fall in arterial blood pressure caused by anesthetic drugs or procedures. Ephedrine can raise blood pressure when anesthesia reduces sympathetic tone or vascular resistance.
Ephedra: A genus of shrubs that produce ephedrine-related alkaloids. Ephedra plants are a natural source of ephedrine and related compounds.
Ephedra supplement controversy: A public-health and regulatory dispute over weight-loss and performance supplements containing Ephedra alkaloids. Reports of serious cardiovascular events prompted restrictions on many ephedra-containing supplements.
Norepinephrine: A catecholamine that acts as a neurotransmitter and hormone in sympathetic signaling. Ephedrine promotes norepinephrine release from nerve endings, amplifying sympathetic signaling.
Vasopressor: A drug that raises blood pressure by increasing vascular tone, cardiac output, or both. Ephedrine is a vasopressor whose effects include increased heart rate and cardiac contractility.
Ephedrine alkaloids: A group of related alkaloids found in Ephedra species, including ephedrine and pseudoephedrine. Ephedrine belongs to this chemical family, whose members differ in potency and effects.
Dietary Supplement Health and Education Act of 1994: A United States law that established a distinct regulatory framework for dietary supplements. Its supplement framework shaped how ephedra products were marketed and regulated before federal restrictions.
Indirect sympathomimetic: A drug that increases sympathetic signaling mainly by altering neurotransmitter release or availability. Ephedrine combines indirect norepinephrine release with direct adrenergic receptor activation.
Nasal decongestant: A medicine that reduces nasal congestion by constricting blood vessels in nasal tissues. Ephedrine’s vasoconstricting action once made it a common ingredient in oral decongestants.

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