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In page Management of Parkinson's disease:

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Selegiline is in a group of medications called monoamine oxidase type B (MAO-B) inhibitors.[1] Selegiline is used to help control the symptoms of Parkinson's disease in people who are taking levodopa and carbidopa combination (Sinemet). Selegiline may help people with PD by stopping the effects of levodopa/carbidopa from wearing off, and increasing the length of time levodopa/carbidopa continues to control symptoms.