[Interactions of neurotropic drugs with phosphatidylcholine bilayer. Effects on sorption of polyvalent cations].

It is found that neurotropic drugs, whose molecules have positively-charged amino groups and a considerable hydrophobic region (in size), can be incorporated into the phospholipid bilayers. This results in a decrease of the lifetime of Pr3+ cations in the membrane-associated state. No correlation was found to exist between local anaesthesia activity of the study drugs and its capability of displacement polyvalent cations from the membrane surface.