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Dopamine, sold under the brand name Intropin among others, is a medication most commonly used in the treatment of very low blood pressure, a slow heart rate that is causing symptoms, and, if epinephrine is not available, cardiac arrest. [4] In newborn babies it continues to be the preferred treatment for very low blood pressure. [5]
A dopamine antagonist, also known as an anti-dopaminergic and a dopamine receptor antagonist (DRA), is a type of drug which blocks dopamine receptors by receptor antagonism. Most antipsychotics are dopamine antagonists, and as such they have found use in treating schizophrenia , bipolar disorder , and stimulant psychosis . [ 1 ]
Dopamine receptors are a class of G protein-coupled receptors that are prominent in the vertebrate central nervous system (CNS) and are implicated in many neurological processes, including motivational and incentive salience, cognition, memory, learning, and fine motor control, as well as modulation of neuroendocrine signaling.
Domperidone, sold under the brand name Motilium among others, is a dopamine antagonist medication which is used to treat nausea and vomiting and certain gastrointestinal problems like gastroparesis (delayed gastric emptying). It raises the level of prolactin in the human body and is used off label to induce and promote breast milk production.
A dopamine molecule consists of a catechol structure (a benzene ring with two hydroxyl side groups) with one amine group attached via an ethyl chain. [14] As such, dopamine is the simplest possible catecholamine, a family that also includes the neurotransmitters norepinephrine and epinephrine. [15]
A dopamine agonist is a compound that activates dopamine receptors. There are two families of dopamine receptors, D 1-like and D 2-like. They are all G protein-coupled receptors. D 1 - and D 5-receptors belong to the D 1-like family and the D 2-like family includes D 2, D 3 and D 4 receptors. [1]
Cabergoline is a long-acting dopamine D 2 receptor agonist. In-vitro rat studies show a direct inhibitory effect of cabergoline on the prolactin secretion in the lactotroph cells of the pituitary gland and cabergoline decreases serum prolactin levels in reserpinized rats.
[8] [9] [10] It also acts as a norepinephrine–dopamine reuptake inhibitor (NDRI) to a lesser extent. [8] [10] The drug robustly and dose-dependently elevates brain norepinephrine and dopamine levels in animals. [8] Phentermine is more potent in its effects on norepinephrine than on dopamine and the drug shows only weak effects on serotonin.