What drug is a powerful stimulant known for its effects on reducing fatigue and increasing well-being?

Cocaine is a powerful stimulant that significantly impacts the central nervous system, leading to marked effects on mood, energy, and overall well-being. It functions primarily by inhibiting the reuptake of dopamine, norepinephrine, and serotonin in the brain. This increased availability of neurotransmitters contributes to enhanced feelings of euphoria, energy, and alertness, while simultaneously reducing the perception of fatigue.

In contrast, heroin is an opiate that primarily produces pain relief and euphoria but does not typically act as a stimulant. Prozac, an antidepressant, works primarily as a selective serotonin reuptake inhibitor (SSRI) and is not classified as a stimulant. LSD is a hallucinogenic drug that alters perception but does not have stimulating effects in the same way cocaine does. Therefore, cocaine stands out as the correct answer due to its distinct properties as a powerful stimulant.