partition coefficient (logKow) is an important parameter when assessing the
environmental fate of pharmaceuticals. Values of logKow indicates a compounds
ability to partition between organic and aqueous phase, and therefore can indicate
whether it is hydrophobic or hydrophilic. A high Kow value denotes hydrophobicity
and a low Kow denotes hydrophilicity (Miller et al., 1985).
The ERA specifies that following phase I analysis, if a compound with a logKow
below 4.5 that it should progress to screening in phase II (EMA, 2006).