Tardive dyskinesia (TD) is a disorder that results in involuntary, repetitive body movements. This may include grimacing, sticking out the tongue, or smacking of the lips. Additionally there may be rapid jerking movements or slow writhing movements. In about 20% of people decreased functioning results.
Tardive dyskinesia occurs in some people as a result of long-term use of neuroleptic medications (antipsychotics, metoclopramide). These medications are usually used for mental illness, but may also be given for gastrointestinal or neurological problems. The condition typically only develops after months to years of use . The diagnosis is based on the symptoms after ruling out other potential causes.