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“We conclude that there is a clinically important interaction between digitoxin and quinidine , but it is to a lesser extent and is caused by different mechanism, in part, than the interaction between digoxin and quinidine.”
Clinical pharmacology and therapeutics • 1986 | View Paper
“Although the Na+/H+ exchange activity was not inhibited by tetrodotoxin or digitoxin , it was inhibited by quinidine , quinacrine, amiloride, and several amiloride derivatives.”