isoniazid

noun
iso·​ni·​a·​zid | \ ˌī-sə-ˈnī-ə-zəd How to pronounce isoniazid (audio) \

Definition of isoniazid

: a crystalline compound C6H7N3O used in treating tuberculosis

Examples of isoniazid in a Sentence

Recent Examples on the Web In the past decade, scientists have come up with two shorter courses: a drug called rifampin taken every day for four months; or a combination of isoniazid and rifapentine, taken once weekly for three months. Apoorva Mandavilli, New York Times, "A Simple Regimen Can Prevent TB. Why Aren’t More People on It?," 23 Sep. 2019 But several studies have shown that isoniazid combined with rifapentine prevents TB if the pills are taken once a week for 12 weeks. Jon Cohen, Science | AAAS, "A powerful tuberculosis drug gets a deep price cut," 31 Oct. 2019 The World Health Organization has estimated that in 2016, some 600,000 cases of tuberculosis were resistant to at least two of the front-line drugs used to treat tuberculosis, rifampicin and isoniazid. Melissa Healy, latimes.com, "Scientists have a promising new approach for treating drug-resistant tuberculosis," 25 Apr. 2018 Doctors have been prescribing two TB drugs, rifampicin and isoniazid, for almost half of a century. Emily Baumgaertner, New York Times, "TB Treatment May Leave Some Patients Contagious," 6 Apr. 2018 Patients received standard drug doses to treat TB, but concentrations in the blood were found to be jarringly low: 84 percent of the participants had substandard levels of isoniazid, and 78 percent fell below targets for rifampicin. Emily Baumgaertner, New York Times, "TB Treatment May Leave Some Patients Contagious," 6 Apr. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'isoniazid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of isoniazid

1952, in the meaning defined above

History and Etymology for isoniazid

is- + nicotinic acid + hydrazide

Keep scrolling for more

Learn More about isoniazid

Time Traveler for isoniazid

Time Traveler

The first known use of isoniazid was in 1952

See more words from the same year

Statistics for isoniazid

Cite this Entry

“Isoniazid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isoniazid. Accessed 14 Aug. 2020.

Keep scrolling for more

More Definitions for isoniazid

isoniazid

noun
iso·​ni·​a·​zid | \ ˌī-sə-ˈnī-ə-zəd How to pronounce isoniazid (audio) \

Medical Definition of isoniazid

: a crystalline compound C6H7N3O used in treating tuberculosis

called also isonicotinic acid hydrazide

More from Merriam-Webster on isoniazid

Britannica.com: Encyclopedia article about isoniazid

Comments on isoniazid

What made you want to look up isoniazid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!