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Levodopa-induced dyskinesia (LID) is a form of dyskinesia associated with levodopa (l-DOPA), used to treat Parkinson's disease. It often involves hyperkinetic movements, including chorea, dystonia, and athetosis. [1] In the context of Parkinson's disease (PD), dyskinesia is often the result of long-term dopamine therapy.
l-DOPA can be manufactured and in its pure form is sold as a drug with the INN Tooltip International Nonproprietary Name levodopa. Trade names include Sinemet, Pharmacopa, Atamet, and Stalevo. As a drug, it is used in the clinical treatment of Parkinson's disease and dopamine-responsive dystonia. l-DOPA has a counterpart with opposite chirality ...
Levodopa crosses the protective blood–brain barrier, whereas dopamine itself cannot. [3] [4] Thus, levodopa is used to increase dopamine concentrations in the treatment of Parkinson's disease, Parkinsonism, dopamine-responsive dystonia and Parkinson-plus syndrome. The therapeutic efficacy is different for different kinds of symptoms.
[170] [171] [note 1] Symptoms may become unresponsive to levodopa, with sudden changes between a state of mobility ("ON time") and immobility ("OFF time"). [173] Long-term levodopa use may also induce dyskinesia and motor fluctuations. Although this often causes levodopa use to be delayed to later stages, earlier administration leads to ...
The first symptoms of neuroleptic malignant syndrome are usually muscle cramps and tremors, fever, symptoms of autonomic nervous system instability such as unstable blood pressure, and sudden changes in mental status (agitation, delirium, or coma). Other possible symptoms include sweating, trouble swallowing, tremors, incontinence, and mutism.
Characteristic symptoms are increased muscle tone (dystonia, such as clubfoot) and Parkinsonian features, typically absent in the morning or after rest but worsening during the day and with exertion. Children with dopamine-responsive dystonia are often misdiagnosed as having cerebral palsy. The disorder responds well to treatment with levodopa.
Levodopa (or L-DOPA) has been the most widely used treatment for over 30 years. [3] L-DOPA is transformed into dopamine in the dopaminergic neurons by dopa-decarboxylase. [3] Since motor symptoms are produced by a lack of dopamine in the substantia nigra, the administration of L-DOPA temporarily diminishes the motor symptoms. [3]
Levodopa (L-DOPA) is an amino acid and is the precursor to the neurotransmitters dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline). As per a study of six narcoleptic patients it was found that L -DOPA improved vigilance and performance as evaluated by the AVS and the FCRTT, while the capacity to fall asleep rapidly remained ...