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Dyskinesias are disorders of movement; as with bradykinesia, the term usually (but not always) indicates a neurological disorder, not a muscular one. In neurology, it generally refers to an inability to suppress involuntary movements. For example, one form of dyskinesia, called tardive dyskinesia, sometimes appears in patients who have been taking antipsychotic drugs for many years (usually for treatment of schizophrenia). Patients with this problem can't keep from moving the lips and tongue; they're constantly puckering their lips, chewing motions, sticking out their tongue, and making chewing motions. Unfortunately, there's no way to cure tardive dyskinesia: although symptoms diminish if you increase the dose, they'll recur after a while; reducing the dose only makes the symptoms worse.

The tics of Tourette's syndrome are another form of dyskinesia.

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