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Caffeine increases your blood pressure and heart rate. It stimulates the cardiovascular system. If too much caffeine is present, it can stimulate the heart to the point of ventricular fibrillation, which can lead to rapid cardiac arrest and death.
It is very difficult to overdose on caffeine using coffee, but caffeine pills are easy to overdose on and deaths have been reported from caffeine pills. They should be used with caution. One or two of the average caffeine pill should be enough for most people to get a coffee-like buzz.
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