"Lack of clinically significant interference by spironolactone with the Axsym Digoxin II assay" only applies to low-dose therapy with spironolactone.
Steimer
Werner
W
D002316:Cardiotonic Agents / Q000097:blood*; D003429:Cross Reactions; D004077:Digoxin / Q000097:blood*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D006801:Humans; D007124:Immunoenzyme Techniques / Q000379:methods*; D000451:Mineralocorticoid Receptor Antagonists / Q000097:blood*; D013148:Spironolactone / Q000097:blood*
D002316:Cardiotonic Agents; D000451:Mineralocorticoid Receptor Antagonists; D013148:Spironolactone; D004077:Digoxin