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In page Management of Parkinson's disease:

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Several molecules have been proposed as potential treatments.[1] However, none of them has been conclusively demonstrated to reduce degeneration.[1] Agents currently under investigation include antiapoptotics (omigapil, CEP-1347), antiglutamatergics, monoamine oxidase inhibitors (selegiline, rasagiline), promitochondrials (coenzyme Q10, creatine), calcium channel blockers (isradipine) and growth factors (GDNF).[1] Preclinical research also targets alpha-synuclein.[2]