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Dyskinesia is a term used to describe a neurological disorder. A person with dyskinesia typically has trouble making voluntary muscle movements and makes involuntary movements with no control over them. It is usually easy to recognize these involuntary movements, or tics, in people that have Parkinson’s Disease, such as boxer Muhammed Ali and American actor Michael J. Fox. There are five main types of dykinesia — tardive, tremor, dystonia, chorea and myclonus.

Tardive dykinesia generally occurs late in life. It can be a side effect of certain antipsychotic medications, particularly trifluoperazine, haloperidol, metoclopramide and fluphenazine. The disorder usually presents itself in a patient's face. Symptoms may include grimacing, chewing, abnormal tongue movement and swinging of the jaw. Sometimes the dykinesia becomes permanent, even if the affected person stops taking the drug causing it. The longer someone takes medications of this kind, the more likely this can be.

Tremor dykinesia usually presents itself as trembling, usually in the legs, hands, head, trunk or voice. This shaking is typically more noticeable when a person stretches his or her limbs, such as to emphasize a point or to greet another person. This type often starts in a person’s dominant hand and steadily becomes worse over time.

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