doxycycline

noun

doxy·​cy·​cline ˌdäk-sə-ˈsī-ˌklēn 

: a broad-spectrum tetracycline antibiotic C₂₂H₂₄N₂O₈ used orally to treat various bacterial infections

Examples of doxycycline in a Sentence

Recent Examples on the Web

In the past, some doctors gave long-term doses of doxycycline to children, which caused permanent staining of their tooth enamel. —Clara Migoya, AZCentral.com, 12 July 2025

If they’re promptly diagnosed with and treated for Lyme—which generally means two to three weeks of the antibiotic doxycycline—the story often ends there. —Angela Haupt, Time, 18 June 2025

The oral antibiotic doxycycline is used for STI prevention. —Benjamin Ryan, NBC News, 12 Nov. 2024

The man, meanwhile, finally received the proper course of antibiotics recommended by the CDC for brucellosis treatment, which was a combination of oral doxycycline and rifampin for six weeks. —Ars Technica, 19 Mar. 2025

Word History

Etymology

deoxy- + tetracycline

First Known Use

1966, in the meaning defined above

Rhymes for doxycycline

• anthracycline
• minocycline
• tetracycline
• chlortetracycline
• oxytetracycline

Medical Definition

doxycycline

noun

doxy·​cy·​cline ˌdäk-sə-ˈsī-ˌklēn 

: a broad-spectrum tetracycline antibiotic C₂₂H₂₄N₂O₈ used orally to treat various bacterial infections