The aim of this study was to assess the incidence of dyskinesias during long-term treatment of Parkinson’s disease with levodopa. Material and methods: Analysis encompassed 103 patients with Parkinson’s disease (54 with and 49 without dyskinesias) of similar age (64.37±6.94 vs. 64.94±6.81 years). Their clinical and neurological status was assessed using the Hoehn-Yahr scale, Unified Parkinson’s Disease Rating Scale (UPDRS), Mini-Mental State Examination (MMSE). Each patient has had a CT scan to assess brain atrophy and angiogenic lesions. Risk factors included in the analysis were: hypertension, hypercholesterolaemia, ischaemic heart disease and diabetes. Results: Dyskinesia more frequently developed in persons with hypertension, ischaemic heart disease, hypercholesterolaemia or diabetes. Furthermore, they presented more frequently cortical atrophy in their CT scans as compared with the control group (25 vs. 8). Levodopa doses were higher in patients with dyskinesias (1013.43±260.61 vs 877.55±216.46 mg) and duration of treatment was on the average 2 years longer than in the control group. Performance status as assessed by Hoehn-Yahr and UPDRS rating systems was similar in both groups. Conclusions: Our study indicates that in patients with Parkinson’s disease dyskinesias develop mostly in cases of more advanced neurodegenerative process, associated with longer duration of symptoms and use of higher doses of levodopa. This correlated with higher prevalence of additional risk factors in this group of patients.