Involuntary movements in certain neurological disorders such as Parkinson’s disease or psychosis; generally a side effect of medications used to treat the disorder.
Example: After taking neuroleptics for more than twenty years to treat her schizophrenia, a middle-aged woman displays sucking, licking, and pouting movements.
This website is a great resource for more information about this issue: http://www.ninds.nih.gov/disorders/tardive/tardive.htm
Last reviewed: By John M. Grohol, Psy.D. on 18 Aug 2010