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doxycycline

American  
[dok-see-sahy-kleen, -klin] / ˌdɒk siˈsaɪ klin, -klɪn /

noun

Pharmacology.
  1. a synthetic analog of a broad-spectrum antibiotic tetracycline drug, C 22 H 24 N 2 O 8 , used against a wide range of susceptible Gram-positive and Gram-negative organisms.


doxycycline British  
/ ˌdɒksɪˈsaɪklɪn /

noun

  1. a tetracycline antibiotic used to treat conditions caused by a wide range of bacteria, including anthrax

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of doxycycline

Contraction of deoxytetracycline


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Paul Keim, plague researcher and professor at Northern Arizona University, also said there is no reason for people in North America to start taking doxycycline.

From Barron's ● Oct. 8, 2026

Scientists found that adolescents receiving mental health care who were prescribed the antibiotic doxycycline were significantly less likely to develop schizophrenia later in life than those treated with other antibiotics.

From Science Daily ● Nov. 6, 2025

One of the first things they did as husband and wife was to take doxycycline pills from their local health centre.

From BBC ● Jul. 23, 2025

Among them was the prediction that doxycycline, an antibiotic, could interact with warfarin, a commonly prescribed blood-thinner.

From Science Daily ● Feb. 20, 2024

Patients who are not pregnant can use the antibiotic doxycycline to treat syphilis, but health officials are concerned that the 14- to 28-day timeline of treatment is difficult to complete, leaving infected people uncured.

From Seattle Times ● Nov. 7, 2023

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