We present here three cases of respiratory dyskinesia (RD). RD was observed with a video recording and other recordings were made of a respiratory airflow with a thermistor, and abdominal movement with a strain gauge. Neurological findings and CT scanning indicated marked organic changes in the brain in these 3 cases. RD was complicated with tardive dyskinesia of the tongue and lips, and the symptoms were aggravated during stress and absent during sleeping, which are the characteristic features of extrapyramidal symptoms. The symptoms of the three cases have improved by decreasing the dose of butyrophenone derivatives and discontinuing anti-parkinsonian drugs, which suggested that an intracerebral imbalance of DA and ACh may be the cause of RD.