DEAR DR. ROACH: Several months ago, I developed a case of a bigeminy heartbeat, so my cardiologist prescribed metoprolol. At about the same time, I had reduced my intake of magnesium from about 50 percent of the daily value (DV) to 35 percent. (This may have preceded the bigeminy onset.)Quite by accident, I read an article recommending magnesium for a heart arrhythmia....
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