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Blocking dopamine reuptake means the neurotransmitter stays in the synaptic gap longer, boosting signaling. Cocaine works by binding to the dopamine transporter and preventing dopamine from being taken back into the neuron. This causes a rapid buildup of dopamine in reward pathways, leading to quick, intense feelings of alertness and euphoria. Among the options, cocaine is the classic drug that produces those effects via direct blocking of dopamine reuptake.

Amphetamine and methamphetamine increase dopamine too, but mainly by forcing release of dopamine from storage sites and altering transporter function, which gives longer-lasting and somewhat different effects. MDMA (Molly) primarily elevates serotonin, with some dopaminergic effects, so it doesn’t fit the description of a pure dopamine reuptake blocker.