Opicapone is a potent, reversible, and peripherally-acting third-generation inhibitor of catechol-o-methyltransferase (COMT), an enzyme involved in the breakdown of various catecholamines including dopamine. Many patients with Parkinson’s disease treated with levodopa plus a dopa decarboxylase (DDC) inhibitor (eg carbidopa) experience motor complications over time, which calls for the management of these symptoms through the use of a dopamine agonist, a monoamine oxidase B inhibitor (selegiline, rasagiline), a catechol-O-methyl transferase (COMT) inhibitor, or amantadine, or using a modified-release formulation of levodopa. Opicapone is used for adjunct therapy to levodopa and carbidopa in adult patients with Parkinson's disease and end-of-dose motor fluctuations. Opicapone was approved for use by the European Commission in June 2016 and the FDA in April 2020. It is marketed under the brand name Ongentys as once-daily oral capsules. Exhibiting a long duration of action that exceeds 24 hours, opicapone can be administered once-daily and demonstrates the lowest risk for cytotoxicity compared to other catechol-O-methyltransferase inhibitors.

Opicapone is indicated as adjunctive therapy in adults with Parkinson’s disease and end-of-dose motor fluctuations or “off” episodes whose symptoms cannot be stabilized on the combination therapy of levodopa and DOPA decarboxylase inhibitor (e.g., carbidopa).

• Parkinson's Disease (PD)