## Wikipedia - Biodisponibilità (it) bioavailabilty

in pharmacokinetics
https://doi.org/10.1351/goldbook.BT06813
Ratio of the systemic @[email protected] from extravascular (ev) exposure to that following intravenous (iv) exposure as described by the equation: $F=\frac{A_{\text{ev}}\ D_{\text{iv}}}{B_{\text{iv}}\ D_{\text{ev}}}$ where $$F$$ is the bioavailabilty, $$A$$ and $$B$$ are areas under the (plasma) concentration-time curve following extravascular and intravenous administration, respectively, and $$D_{\text{ev}}$$ and $$D_{\text{iv}}$$ are the administered extravascular and intravenous doses.
Source:
PAC, 2004, 76, 1033. (Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)) on page 1041 [Terms] [Paper]