A stimulant drug is a substance that increases activity in the central nervous system, leading to heightened alertness, elevated mood, and increased energy.
Dopamine is a neurotransmitter that plays a key role in reward-motivated behavior. It is released in response to pleasurable activities or substances, including stimulant drugs.
Amphetamines are synthetic stimulant drugs that increase the release of dopamine and norepinephrine in the brain. They are commonly used to treat attention deficit hyperactivity disorder (ADHD) but can also be abused recreationally.
Caffeine is a natural stimulant found in coffee, tea, and other beverages. It blocks adenosine receptors in the brain, preventing drowsiness and promoting wakefulness.