What is the bioavailability of escitalopram?

Absorption is almost complete, with limited first-pass metabolic loss, which is reflected in a high absolute bioavailability (about 80%); data extrapolated from citalopram. First-pass metabolism can partly explain inter-individual variation in plasma concentration for a given dose. Peak concentrations are obtained at about 3–4 hours after dosing.

 

Reference:

Escitalopram SPC