The best replacement for quinidine is quinine.

The best alternatives to quinidine are rated as following:
★★★★★  quinine
★  procainamide
★  propafenone

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Speaking about quinidine, one probably shouldn't forget about digoxin.

Other search terms related to quinidine and their ratings are:
★★★★★ digoxin
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quinidine
quinine
procainamide