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Drinking caffeinated beverages can temporarily cause a spike in blood pressure. If you have reason to be worried about caffeine's effect on your blood pressure, try limiting the amount of caffeine you drink to 200 milligrams a day — about the same amount as in two 12-ounce (355-milliliter) cups of brewed coffee. Also, avoid caffeine right before activities that naturally increase blood pressure, such as exercise or hard physical labor.
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