Lipophilicity is one of the key properties of a potential drug that determines the solubility, the ability to penetrate through cell barriers, and transport to the mol. target.It affects pharmacokinetic processes such as adsorption, distribution, metabolism, excretion (ADME).The 10-substituted 1,9-diazaphenothiazines show promising if not impressive in vitro anticancer potential, which is associated with the activation of the mitochondrial apoptosis pathway connected with to induction BAX, forming a channel in MOMP and releasing cytochrome c for the activation of caspases 9 and 3.In this publication, the lipophilicity of previously obtained 1,9-diazaphenothiazines was determined theor. using various computer programs and exptl. using reverse-phase thin-layer chromatog. (RP-TLC) and a standard curve.The study presents other physicochem., pharmacokinetic, and toxicol. properties affecting the bioavailability of the test compoundsADME anal. was determined in silico using the SwissADME server.Mol. targets studies were identified in silico using the SwissTargetPrediction server.Lipinski′s rule of five, Ghose′s, and Veber′s rules were checked for the tested compounds, confirming their bioavailability.