Drug treatment can improve the symptoms of PD and improve the quality of life of patients.[26] At present, compound levodopa, dopamine receptor agonists, monoamine oxidase B inhibitors, catecholamine-O-methyltransferase inhibitors, etc are common drugs for the treatment of PD.[27] Dopamine receptor agonists can directly act on postsynaptic dopamine receptors to improve symptoms.[28] Ropinirole is a new type of dopamine D2 receptor agonist.[29] A number of clinical studies[30–32] have discussed its therapeutic effect and safety, but the results are not consistent. Here, DRD2 is linked to Parkinson disease.