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doxycycline

American

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

noun

Pharmacology.

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

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.

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

Most patients receive doxycycline, an antibiotic that usually clears up the infection.

From Science Daily • Mar. 19, 2024

Her primary care physician prescribed doxycycline, but that was also ineffective.

From Seattle Times • Dec. 6, 2023

Many health plans cover doxycycline, and even without insurance, it costs around $24 for 20 tabs, Khan said.

From Seattle Times • Oct. 14, 2023

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023