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
An investigational therapy from Alnylam Pharmaceuticals did not meet its primary goal of significantly lowering blood pressure in a new phase 2 study, raising questions about its benefit.
—
Amy Feldman, Forbes.com, 3 Sep. 2025
While still taking their regular medication, study patients receive monthly injections of an investigational drug that slows production of the surface antigen, the hallmark of the infection.
—Jia H. Jung, Mercury News, 1 Sep. 2025
Recently, an investigational brain-computer interface system developed by the University of California, Davis, has allowed a patient with ALS to communicate in real time.
—Mrigakshi Dixit, Interesting Engineering, 1 Sep. 2025
Schmid worries their absence could impact the implementation of a new investigational PrEP medication that, if approved, would only need to be administered twice a year.
—Joseph Choi, The Hill, 15 Apr. 2025
See All Example Sentences for investigational
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Amy Feldman, Forbes.com, 3 Sep. 2025
While still taking their regular medication, study patients receive monthly injections of an investigational drug that slows production of the surface antigen, the hallmark of the infection.
—Jia H. Jung, Mercury News, 1 Sep. 2025
Recently, an investigational brain-computer interface system developed by the University of California, Davis, has allowed a patient with ALS to communicate in real time.
—Mrigakshi Dixit, Interesting Engineering, 1 Sep. 2025
Schmid worries their absence could impact the implementation of a new investigational PrEP medication that, if approved, would only need to be administered twice a year.
—Joseph Choi, The Hill, 15 Apr. 2025
See All Example Sentences for investigational
Cite this Entry
“Investigational.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/investigational. Accessed 15 Sep. 2025.
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