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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 ]
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.
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 ...
It can also be difficult to establish cause and effect. For example, raised levels of dopamine may be a consequence rather than a cause of schizophrenia. Many psychologists criticise psychiatry for focusing its attention primarily on symptoms and for assuming that relieving symptoms with drugs cures the problem.
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 ...
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]
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 ...
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 ...