We have partially purified a digitalis-like extract from human urine by means of high pressure liquid chromatography (HPLC). Four fractions, giving positive activity for the cross-reaction in the digoxin radioimmunoassay, Na-K-ATPase inhibition or competition with ouabain binding to its receptor, were detected on HPLC. Among these fractions, the first (F-l) was shown to contain the principle fraction, sharing all the activities, and to exhibit quite similar characteristics to ouabain in the modes of Na-K-ATPase inhibition, ouabain displacement activity and positive inotropic action.

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