What do stimulant drugs increase in a person's body?

Stimulant drugs are known for their ability to enhance certain physiological functions in the body. One of their primary effects is the increase in heart rate. This occurs because stimulants, such as caffeine, amphetamines, and certain prescription medications, activate the sympathetic nervous system, which leads to the release of adrenaline. This release results in a faster heartbeat and can also raise blood pressure.

Additionally, while stimulants can enhance alertness and attention, the specific choice regarding heart rate directly correlates with the physiological changes that occur with stimulant use. The increase in heart rate is one of the defining characteristics of stimulant drugs, distinguishing their effects from those of depressants, which typically slow down heart rate and promote relaxation.