Levetiracetam Administration for the Management of Levodopa-Induced Dyskinesias in Parkinson's Disease

Inclusion Criteria: Diagnosis of PD will be according to the criteria of United Kingdom Parkinson's Disease Society Brain Bank. Other inclusion criteria: * Patients between ages 30 and 80 * Hoehn and Yahr stage of PD over IIb * Levodopa-induced dyskinesias (LID) despite optimization of antiparkinsonian medication * LID severity 2 on item 32 and duration 2 on item 33 of the Unified Parkinson's Disease Rating Scale (UPDRS) part IV * Patient is willing to adhere to protocol requirements as evidence by written informed consent Exclusion Criteria: * Patient has a history of any medical condition or clinically significant laboratory abnormalities that can subject them to unwarranted risk. * Female patient is pregnant or breastfeeding or has not been using or was not continuing to use an adequate contraceptive method for the last 30 days, or is not at least one year post-menopausal. * Patient with ablative surgeries or DBS implantation electrodes for diseases of the basal ganglia. * Patient has a low Mini-mental Examination MMSE score \<25 or has a history of bipolar psychosis or schizophrenia. * Patient is unwilling to sign an informed consent or to comply with protocol requirements. * Patient is taking or has taken in the past month amantadine.