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How do amphetamines increase focus and energy?

Amphetamines are stimulants that increase focus and energy by boosting the activity of dopamine and norepinephrine in the brain. They do this by increasing the release of these neurotransmitters and blocking their reuptake, which keeps them active longer. This amplifies signals in the brain areas responsible for attention, motivation, and alertness, making it easier to concentrate on tasks and feel more awake. At high doses or with misuse, they can cause anxiety, insomnia, or heart problems.