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antidepressant

American  
[an-tee-di-pres-uhnt, an-tahy-] / ˌæn ti dɪˈprɛs ənt, ˌæn taɪ- /
Also anti-depressant,

adjective

  1. of or relating to a substance that is used in the treatment of mood disorders, as characterized by various manic or depressive affects.


noun

antidepressants plural
  1. Also called energizer, psychic energizer.  any such substance, as a tricyclic antidepressant, MAO inhibitor, or lithium.

antidepressant British  
/ ˌæntɪdɪˈprɛsənt /

noun

  1. any of a class of drugs used to alleviate depression

"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

adjective

  1. of or relating to this class of drugs

"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
antidepressant Scientific  
/ ăn′tē-dĭ-prĕsənt,ăn′tī- /
  1. A drug used to prevent or treat depression.


Other Word Forms

Noun Inflected Forms

Etymology

Origin of antidepressant

First recorded in 1960–65; anti- + depressant

Explanation

An antidepressant is a drug used to treat depression. Unfortunately, many antidepressants have unwanted side effects. Depression is a form of extreme sadness, when you're so sad that it impairs your ability to function. Words starting with anti are the opposite or go against other things. Antidepressants, then, are drugs that fight depression. If you’re depressed, a doctor can prescribe an antidepressant such as Prozac or Zoloft. Antidepressants can improve your mood, but they often have side effects such as weight gain or headaches.

Keep Reading on Vocabulary.com

Vocabulary lists containing antidepressant

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:

The evidence offers a compelling explanation for why some damaged valves may deteriorate faster, but it does not replace imaging, clinical evaluation, or individualized decisions about antidepressant treatment.

From Science Daily Jul. 12, 2026

A new study finds no evidence that antidepressant medications cause autism.

From Los Angeles Times Jun. 12, 2026

On the surface level, it sounds nice to tell people that it’s better to try talk therapy and regular exercise than an antidepressant.

From Salon May 18, 2026

The median length of antidepressant treatment in the U.S. is five years, another study found, despite limited evidence about the effectiveness of such long-term use.

From The Wall Street Journal May 4, 2026

They’ve upped his antidepressant, which doesn’t seem to make him any less depressed, but helps him to forget that he is.

From "Challenger Deep" by Neal Shusterman

For comparison, the NNT for SSRIs, the most commonly prescribed antidepressants for moderate-to-severe depression, is around 7.

From Science Daily May 28, 2026

Loneliness, isolation from family, and depression can be particularly devastating for the elderly, and antidepressants only go so far.

From Barron's May 21, 2026

Secretary Robert F. Kennedy Jr. recently announced initiatives intended to rein in antidepressants.

From Los Angeles Times May 18, 2026

The complicating factor here is that antidepressants are prescribed in the U.S. at rates that are above the ideal, which no one really disputes.

From Salon May 18, 2026

On the seventh day, Dr. Janeway released me from Quiet Oaks under strict orders to continue taking my antidepressants.

From "We Are the Ants" by Shaun David Hutchinson

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