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We found 3 dictionaries that define the word First pass effect:

General (1 matching dictionary)
  1. First-pass effect, First pass effect: Wikipedia, the Free Encyclopedia

Medicine (2 matching dictionaries)
  1. first-pass effect, First pass effect: Medical dictionary

Definitions from Wikipedia (First pass effect)

noun:  The first pass effect (also known as first-pass metabolism or presystemic metabolism) is a phenomenon of drug metabolism at a specific location in the body which leads to a reduction in the concentration of the active drug before it reaches the site of action or systemic circulation.


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