Endogenous drug-like factors in a Polish population.

In two hundred and twenty-five healthy volunteers not receiving any treatment the occurrence of drug-like factors in blood serum was studied. The examinations were carried out with the use of the fluorescence-polarization-immunoassay (FPIA)-TDx Abbott. The presence of endogenous phenytoin-like, theophylline-like and cyclosporin-like factors has been demonstrated.