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Douglas Severance, MD, Family Medicine, answeredIf you are sensitive to caffeine, it makes good sense to avoid it if you have atrial fibrillation. Talk to your doctor about drinking caffeinated coffee if you have arrhythmias or episodes of atrial fibrillation. The caffeine in coffee is a stimulant and can cause you to have a serious arrhythmia if you are sensitive to it. Keep in mind that other foods, beverages and medications have caffeine in them. For example, energy drinks are usually high in caffeine. Chocolate bars have caffeine, as do some teas, including green tea. Some headache preparations have caffeine, so read the labels carefully.