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EXD is commonly observed in psychostimulant abusers as these drugs directly impact the dopaminergic transporters, increasing the extracellular dopamine levels. [ 21 ] [ 6 ] Amplified excitation of the dopaminergic systems can induce extreme fear and magnify both approach and avoidance behaviors. [ 6 ]
Medications are used to reverse the symptoms of extrapyramidal side effects caused by antipsychotics or other drugs, by either directly or indirectly increasing dopaminergic neurotransmission. The treatment varies by the type of the EPS, but may involve anticholinergic agents such as procyclidine , benztropine , diphenhydramine , and ...
This can result in increased muscle contractility, which can play a role in the breakdown of muscle, muscle rigidity, and hyperthermia. Some antipsychotic drugs, such as typical antipsychotics, are known to block dopamine receptors; other studies have shown that when drugs supplying dopamine are withdrawn, symptoms similar to NMS present ...
Dopamine dysregulation syndrome (DDS) is a dysfunction of the reward system observed in some individuals taking dopaminergic medications for an extended length of time. It is characterized by severely disinhibited patterns of behavior, [1] leading to problems such as addiction to the offending medication, gambling addiction, or compulsive sexual behavior, [2] along with a general orientation ...
In those with dopamine-responsive dystonia, symptoms typically dramatically improve with low-dose administration of levodopa, which is a biochemically significant metabolite of the amino acid phenylalanine, as well as a biological precursor of the catecholamine dopamine, a neurotransmitter. (Neurotransmitters are naturally produced molecules ...
Other hypotheses include increases in the "active" D 2 receptors (termed D 2 High) relative to the "inactive" conformation (D 2 Low). [3] The result is dopamine supersensitivity. It is thought that the psychotic symptoms within schizophrenia are primarily due to overactive dopamine activity in the mesolimbic area of the brain. [4]
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 reuptake inhibitor (DRI) is a class of drug which acts as a reuptake inhibitor of the monoamine neurotransmitter dopamine by blocking the action of the dopamine transporter (DAT). Reuptake inhibition is achieved when extracellular dopamine not absorbed by the postsynaptic neuron is blocked from re-entering the presynaptic neuron.