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Dopamine: one of the catecholamine neurotransmitters in the brain; it is derived from tyrosine and is the precursor to norepinephrine and epinephrine; dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement; dopamine receptors mediate its action.Source: CRISP.t is derived from tyrosine and is the precursor to NOREPINEPHRINE and EPINEPHRINE. Dopamine is a major transmitter in the extrapyramidal system of the brain, and important in regulating movement. A family of receptors (RECEPTORS, DOPAMINE) mediate its action. Source: MeSH 2007.
DRUG CLASS AND MECHANISM: Dopamine is a chemical produced by our body and it has several functions. Dopamine works as a neurotransmitter (chemical that nerves use to communicate) in the brain.It is also converted to norepinephrine, another neurotransmitter. Dopamine increases heart rate and heart muscle contractions.It also causes increases in blood pressure. The FDA approved dopamine in February 1974.opamine works as a neurotransmitter (chemical that nerves use to communicate) in the brain. It is also converted to norepinephrine, another neurotransmitter. Dopamine increases heart rate and heart muscle contractions. It also causes increases in blood pressure. The FDA approved dopamine in February 1974.