What does erythromycin mean?
Erythromycin is a broad-spectrum antibiotic belonging to the macrolide class. Originally discovered in the early 1950s from the soil bacterium Streptomyces erythreus — named for its reddish pigment, from the Greek erythros, meaning 'red' — it works by inhibiting bacterial protein synthesis. Physicians commonly prescribe it to treat respiratory tract infections, skin conditions, some sexually transmitted diseases, and pertussis (whooping cough), and it holds particular importance as an alternative for patients who are allergic to penicillin. The word appears almost exclusively in medical, pharmaceutical, and scientific registers; laypeople encounter it most often on prescriptions or medication labels. It is usually uncountable when referring to the drug generally, but can be pluralized when discussing different preparations or formulations. Though largely superseded in many settings by newer macrolides such as azithromycin and clarithromycin, erythromycin remains widely used worldwide, including in neonatal care as prophylaxis against ophthalmia neonatorum.
nounA broad-spectrum antibiotic of the macrolide class, produced originally by the bacterium Streptomyces erythreus, used to treat a wide range of bacterial infections, especially in patients allergic to penicillin.
- A macrolide antibiotic produced by Streptomyces erythreus, used to treat bacterial infections such as respiratory tract infections, skin infections, and certain sexually transmitted infections.
"The doctor prescribed erythromycin for the patient's chest infection because she was allergic to penicillin."
"The pediatrician prescribed a ten-day course of erythromycin to clear up the child's whooping cough."
"Because he was severely allergic to penicillin, his dentist gave him erythromycin instead as a preventive measure before the procedure."
Rarely pluralized in practice; the plural appears mainly in pharmaceutical or scientific contexts referring to distinct preparations or related compounds.
"Several erythromycins were tested for their effectiveness against resistant strains."
Erythromycin was discovered in soil bacteria in the Philippines in the late 1940s and became a lifesaver for patients who couldn't tolerate penicillin — all thanks to one red-producing microbe.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of erythromycin
The word erythromycin was coined in the early 1950s following the discovery of the antibiotic by scientists at Eli Lilly, combining the Greek root erythros ('red') — a reference to the reddish color of the producing organism Streptomyces erythreus — with the suffix -mycin, standard for antibiotics derived from Streptomyces species. It shares the erythro- root with medical terms like erythrocyte (red blood cell) and erythema (redness of the skin), while its -mycin ending connects it to other Streptomyces-derived drugs such as streptomycin and neomycin.
How erythromycin is actually used
Erythromycin is a technical/medical term used mainly in clinical, pharmaceutical, and scientific contexts rather than everyday conversation. It is typically treated as an uncountable noun when referring to the substance in general, though it can take a plural form when referring to specific preparations or doses.
Easily confused with erythromycin
Erythromycin is an antibiotic drug, while erythropoietin is a hormone produced by the kidneys that stimulates red blood cell production; both share the Greek root erythros (red).
Streptomycin is a different antibiotic (an aminoglycoside derived from Streptomyces griseus) used chiefly against tuberculosis, whereas erythromycin is a macrolide.