Tardive Dyskinesia (TD)

Tardive dyskinesia is a movement disorder of involuntary, repetitive movements, often in the face, tongue, and jaw, that can develop after long-term use of certain psychiatric medications, especially older antipsychotics. Vitamin E and vitamin B6 have the most research behind them, and some studies found signs of benefit for symptoms, though the evidence for each is limited. The studies were modest in size, and vitamin E seemed less helpful once the movements were already established.