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The loss of dopamine with age is thought to be responsible for many neurological symptoms that increase in frequency with age, such as decreased arm swing and increased rigidity. [41] Changes in dopamine levels may also cause age-related changes in cognitive flexibility .
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 trihexyphenidyl.
Dopamine-responsive dystonia (DRD) also known as Segawa syndrome (SS), is a genetic movement disorder which usually manifests itself during early childhood at around ages 5–8 years (variable start age). Characteristic symptoms are increased muscle tone (dystonia, such as clubfoot) and Parkinsonian features, typically absent in the morning or ...
Tardive dyskinesia occurs as a result of long-term use of dopamine-receptor-blocking medications such as antipsychotics and metoclopramide. [1] [2] These medications are usually used for mental illness but may also be given for gastrointestinal or neurological problems. [1] The condition typically develops only after months to years of use.
[121] [122] Patients are typically managed with a holistic approach that combines lifestyle modifications with physical therapy. [158] Current pharmacological interventions purely target symptoms, by either increasing endogenous dopamine levels or directly mimicking dopamine's effect on the patient's brain.
More men than women typically develop hypokinesia, which is reflected in young and middle-aged populations where females have displayed higher levels of nigrostriatal dopamine than males. In the elderly, however, this differentiation is not present. Typically, women exhibit more tremor in the beginning development of hypokinesia.
Stimulants such as nicotine, cocaine and methamphetamine promote increased levels of dopamine which appear to be the primary factor in causing addiction. For other addictive drugs such as the opioid heroin, the increased levels of dopamine in the reward system may play only a minor role in addiction. [113]