Your body works to achieve homeostasis – a balance in all of your bodily systems when they all work together, whether you’re at rest or when you’re exercising.
When you have a drug that selectively targets the heart and raises your heart rate, that balance is disturbed – and this is not okay. Having your heart racing at rest is generally not a comfortable feeling. The heart is pumping more blood, but your other part of your body is not ready to handle the increased rate of blood flowing.
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