||The English used in this article may not be easy for everybody to understand. (July 2013)|
The term tardive dyskinesia relates to a difficult to treat stage of dyskinesia, a serious disorder which consists of involuntary and repetitive movements of certain parts of the human body. The word "tardive" indicates the symptoms have belated onsets. This neurological disorder often comes on after extended use of antipsychotic drugs. Examples of movements in this condition include tongue protrusion, rapid eye movement and lip smacking.