What does ephedrine mean?
Ephedrine is a naturally occurring alkaloid found in plants of the genus Ephedra, notably the Chinese medicinal herb known as ma huang, though most pharmaceutical supplies are now synthesized. Chemically related to adrenaline (epinephrine), it acts as a sympathomimetic agent: it raises blood pressure and heart rate, opens the airways, and relieves nasal congestion. Historically, ephedrine was widely used to treat asthma, hay fever, and low blood pressure, and it remains in use as a decongestant and in anesthesia to counteract hypotension. However, its stimulant properties led to its inclusion in weight-loss and energy supplements, prompting regulatory bans after reports of serious cardiac side effects. Because ephedrine can serve as a precursor in the illicit manufacture of methamphetamine, sales of products containing it are closely monitored and restricted in many countries. The word derives from the genus name Ephedra combined with the chemical suffix -ine, reflecting its identity as a plant-derived alkaloid.
nounEphedrine is a crystalline alkaloid derived from the ephedra plant (and also produced synthetically), used as a stimulant, decongestant, and bronchodilator in medicine.
- A sympathomimetic alkaloid obtained from Ephedra species or synthesized, used as a stimulant, decongestant, bronchodilator, and sometimes to treat hypotension.
"The pharmacist recommended a decongestant containing ephedrine to relieve her nasal congestion."
"Ephedrine was once widely prescribed as a bronchodilator for asthma before safer alternatives became available."
"Because ephedrine can be chemically converted into methamphetamine, many countries now restrict its sale."
Rarely used in plural form; typically treated as an uncountable mass noun when referring to the substance. A plural may occasionally appear when distinguishing different salts or preparations of ephedrine.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of ephedrine
Ephedrine was first isolated from the plant Ephedra in the 1880s by Japanese chemist Nagai Nagayoshi. Its name combines the botanical genus name Ephedra — itself derived from Greek, referring to the plant's horsetail-like appearance — with the suffix -ine used for alkaloids. The compound gained international prominence after pharmacologist K.K. Chen demonstrated its therapeutic value in the 1920s, drawing on centuries of traditional Chinese medicine's use of ma huang.
Related word forms
How ephedrine is actually used
Ephedrine is a technical/medical term. It carries connotations of both legitimate pharmaceutical use and controversy — dietary supplements containing it were linked to serious cardiovascular events and banned by the US FDA in 2004. It is regulated in many countries because it is a precursor in illicit drug synthesis.
Easily confused with ephedrine
Epinephrine (adrenaline) is a hormone and neurotransmitter produced naturally by the adrenal glands, whereas ephedrine is a plant-derived alkaloid with similar but longer-lasting stimulant effects.
Pseudoephedrine is a stereoisomer of ephedrine used primarily as an oral nasal decongestant, while ephedrine has broader stimulant and cardiovascular effects.