Abstract
Buccal uptake, partition characteristics, ionization constants, and urinary excretion were studied for zipeprol and two of its metabolities. Buccal uptake, measured in a single subject, was found to be correlated with n-heptane/water (ph 7.4) partition values of the compounds, and with proportional excreation of the unchanged drug. The importance of the shape of buccal uptake-pH curves in the prediction of absorption and excretion of these compounds is discussed.