As cardiologist I can tell you that metformin is not contraindicated in patients who have heart failure, on contrary, it controls blood suger, lowers levels of cholesterin and so it protects patient's heart vessels. The only conditions when metformin is absolutely contraindicated is acute miocardial infarction and nonstable angina! But, there exists another thing that needs to be considered, metformin has side effect called lactic acidosis, which itself can cause arrhythmias and some other symp ...
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