Coincidence: Arrhythmia is not a listed side effect of flagyl. It was probably just a coincidence.
Answered 6/15/2013
5.1k views
Electrolytes off: Having a stomach flu along with diarrhea can sometimes produce abnormalities in electrolytes such as potassium. This may also have contributed to a cardiac arrhythmia.
Answered 2/20/2015
5.1k views
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