DefinitionTardive dyskinesia is a disorder that involves involuntary movements, especially of the lower face. Tardive means "delayed" and dyskinesia means "abnormal movement."Causes, incidence, and risk factorsTardive dyskinesia is a serious side effect that occurs when you take medications called neuroleptics. It occurs most frequently when the medications are taken for a long time, but in some cases it can also occur after you take them for a short amount of time.The drugs that most commonly cause this disorder are older antipsychotic drugs, including:HaloperidolFluphenazineTrifluoperazineOther drugs, similar to antipsychotic drugs, that can cause tardive dyskinesia include:CinnarizineFlunarizine (Sibelium)MetoclopramideSymptomsFacial grimacingJaw swingingRepetitive chewingTongue thrusti