The authors carried out studies on rats with apnoea, indiced by (+)-tubucurarine and found protective action, due to galantamine, neostigmine, hydrochlorides and jodometilates of 2-aminopyridine, 3-aminopyridine and 4-aminopyridine. Jodmethylates had protective action in larger doses in comparison with the respective hydrochlorides of nonsubstituted pyridilamines. The authors proposed a method for determination and comparison of the effect of compounds, eliminating the action of antidepolarizating myorelaxants, on tubocurarine toxicity.