There are 2 types of drug-induced dyskinesia that result from different pathogenic situations: the levodopa-induced dyskinesia that occurs in patients with Parkinson’s disease and tardive dyskinesia (TD) that occurs due to long-term use of dopamine D2 receptor (D2R) antagonists, such as antipsychotics. This evidence concerns the gene DRD2 and thanatophoric dysplasia.