A compound obtained from cinchona bark and used to treat irregularities of heart rhythm. It is an isomer of quinine.
- Metformin also may interact with medications such as cimetidine, digoxin, amiloride, quinidine, vancomycin, and trimethoprim, and may interfere with vitamin B12 absorption.
- This has been shown to occur with penicillin, valproic acid, quinidine, sulfonamides, cimetidine and heparin.
- Treatment choices are to change the rhythm back to normal and maintain it with medications such as digitalis, quinidine, or other medicines or by electrical stunning of the heart (cardioversion).
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