The story
From DOPA (“dihydroxyphenylalanine”) + -amine. Etymologically unrelated to dope.
Etymology from Wiktionary, CC BY-SA 4.0.
dopamine
Today it means: A monoamine C₈H₁₁NO₂ that is a decarboxylated form of dopa, present in the body as a neurotransmitter and a precursor of other substances including adrenalin. Full definition →