investigational
adjective
in·ves·ti·ga·tion·al
in-ˌve-stə-ˈgā-sh(ə-)nəl 
1
: of or relating to investigation
investigational activities
2
: relating to or being a drug or medical procedure that is not approved for general use but is under investigation in clinical trials regarding its safety and efficacy
an investigational new drug
Examples of investigational in a Sentence
Recent Examples on the Web
Ajax’s lead asset is an investigational, once daily, oral Type II JAK2 inhibitor that’s being studied in a Phase 1 trial in patients with the rare blood cancer myelofibrosis who previously were treated with a Type 1 JAK2 inhibitor.
—
Jeff Marks, CNBC, 27 Apr. 2026
BioAge Labs said Tuesday that its investigational pill for cardiovascular risk prevention significantly reduced inflammation in an early study, as more drug companies target inflammation as a way to treat a range of chronic conditions.
—Elaine Chen, STAT, 21 Apr. 2026
The film shows Dane's desire for the reauthorization of the ACT for ALS, a 2021 law which grants funding to scientific research and expands access to investigational ALS treatments for people who are not otherwise eligible for clinical trials.
—Anthony Robledo, USA Today, 10 Apr. 2026
Clinical study recap The Langenhops enrolled in a clinical trial testing an investigational therapy developed by Rocket Pharmaceuticals.
—Kerry Breen, CBS News, 27 Mar. 2026
See All Example Sentences for investigational
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Jeff Marks, CNBC, 27 Apr. 2026
BioAge Labs said Tuesday that its investigational pill for cardiovascular risk prevention significantly reduced inflammation in an early study, as more drug companies target inflammation as a way to treat a range of chronic conditions.
—Elaine Chen, STAT, 21 Apr. 2026
The film shows Dane's desire for the reauthorization of the ACT for ALS, a 2021 law which grants funding to scientific research and expands access to investigational ALS treatments for people who are not otherwise eligible for clinical trials.
—Anthony Robledo, USA Today, 10 Apr. 2026
Clinical study recap The Langenhops enrolled in a clinical trial testing an investigational therapy developed by Rocket Pharmaceuticals.
—Kerry Breen, CBS News, 27 Mar. 2026
See All Example Sentences for investigational
Cite this Entry
“Investigational.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/investigational. Accessed 2 May. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
