phen·​ter·​mine | \ ˈfen-tər-ˌmēn How to pronounce phentermine (audio) \

Definition of phentermine

: an anorectic drug C10H15N used in the form of its hydrochloride to treat obesity

Examples of phentermine in a Sentence

Recent Examples on the Web

Take, for example, the diet drugs fenfluramine and dexfenfluramine (when combined with phentermine they were commonly known as fen-phen). Neile Grayson, STAT, "Real-world data can help make better drugs and do it faster," 2 May 2018 In 1997, a combo drug containing fenfluramine and phentermine, or fen-phen, was pulled off the market after reports of heart valve damage and deaths. Bradley J. Fikes,, "Orexigen, seller of weight-loss drug Contrave, agrees to sale for $75 million," 23 Apr. 2018 Among them, a Utah doctor was sentenced to three years in prison after pleading guilty to conspiracy to distribute phentermine and conspiracy to commit money laundering. Danny Robbins,, "This weight-loss drug has gotten some doctors in trouble," 21 Jan. 2018 The main active ingredient is phentermine, which was not the cause of her death. Rene Rodriguez, miamiherald, "A popular real estate exec died suddenly at home. Detectives think it could be homicide. | Miami Herald," 27 Feb. 2018 Physicians like phentermine because of its record for safety as well as its affordability. Danny Robbins,, "This weight-loss drug has gotten some doctors in trouble," 21 Jan. 2018 When phentermine was exerting its maximum effect, Mr. Elias ate less no matter what else was going on in his life. Gina Kolata, New York Times, "One Weight-Loss Approach Fits All? No, Not Even Close," 12 Dec. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'phentermine.' 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 phentermine

1961, in the meaning defined above

History and Etymology for phentermine

probably from phenyl + tert- (from tertiary) + amine

Keep scrolling for more

Learn More about phentermine

Statistics for phentermine

Look-up Popularity

Time Traveler for phentermine

The first known use of phentermine was in 1961

See more words from the same year

Keep scrolling for more

More Definitions for phentermine


phen·​ter·​mine | \ ˈfen-tər-ˌmēn How to pronounce phentermine (audio) \

Medical Definition of phentermine

: an anorectic drug administered in the form of its hydrochloride C10H15N·HCl to treat obesity

Comments on phentermine

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


to form ideas or theories about something

Get Word of the Day daily email!

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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

Love words? Need even more definitions?

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