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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.
Ergot-derived dopamine agonists are a group of medicines consisting of bromocriptine, cabergoline, dihydroergocryptine, lisuride and pergolide. They have been available on the market for many years and are mainly used to treat Parkinsonâs disease, either on their own or in combination with other medicines. Doctors should prescribe ergot-derived dopamine agonists according to the updated prescribing information. 2  Ergot-derived dopamine agonists should not be taken by patients who have had fibrosis in the heart, lungs or abdomen. 3  The absence of fibrosis in the heart should be verified before treatment is started.