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This is a multicenter, randomized, three-arm, parallel-group, double-blind, placebo-controlled, study to evaluate the efficacy, safety and pharmacokinetics (PK) of pridopidine vs. placebo for the treatment of Levodopa Induced Dyskinesia (LID) in patients with Parkinson Disease.

Inclusion Criteria:

• Provides signed informed consent form.
• Has clinical diagnosis of Parkinson's Disease (PD).
• Has Levodopa-induced dyskinesia (LID).
• Patient and/or study partner must demonstrate ability to keep accurate home diary of PD symptoms.
• Has stable anti-PD treatments for at least 28 days prior to start of study treatment and kept constant throughout study.
• All routine and allowed prescription/non-prescription medications and/or nutritional supplements taken regularly must be at stable dosage for at least 28 days prior to start of study treatment and maintained throughout study.

Exclusion Criteria:

• Diagnosis of atypical Parkinsonism.
• Treatment with dopamine blocking drugs.
• History of surgical intervention related to PD, such as deep brain stimulation.
• History of severe depression, psychosis or hallucinations within 6 months prior to screening; active suicidal ideation; or suicidal attempt within 5 years prior to screening.
• History of certain cancers within 5 years prior to screening.
• Significant cardiac event within 12 weeks prior to Baseline or history of certain cardiac arrhythmias.
• History of epilepsy or seizures within 5 years prior to screening.
• Females who are pregnant or breastfeeding.
• Sexually active female patients who are not surgically sterile or at least 2 years postmenopausal prior to screening, and who do not agree to utilize a highly effective hormonal method of contraception in combination with a barrier method, from screening until at least 4 weeks after completion of study treatment.
• Male patients not using highly effective contraception or not agreeing to continue highly effective contraception until at least 90 days after the completion of study treatment.
• Treatment with any investigational product within 30 days of screening or plans to participate in another clinical study assessing any investigational product during the study.

Other protocol-defined inclusion/exclusion criteria could apply.

Data and results are owned by the sponsor. Results can be used by the institution for (a) internal noncommercial research, education and patient care, and (b) as required under applicable laws and regulations. Other uses require prior written consent of the sponsor.