acetylator

noun
acet·y·la·tor | \ə-ˈse-tə-ˌlā-tər \

Medical Definition of acetylator 

: an organism that acetylates a substance during metabolism used especially to describe the rate at which a person acetylates certain drugs (such as isoniazid, hydralazine, or sulfamethazine) in the body People known as slow acetylators, for instance, take a longer time than fast acetylators to clear certain drugs from the liver.— Robin Marantz Henig, The New York Times, 10 Oct. 2004

Note: The variation among acetylators has been shown to be genetically determined. Slow acetylators may experience undesirable side effects resulting from higher drug concentrations in the body.

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