Back Generic Tolcapone Mechanism of Action Description: Tolcapone is a reversible, catechol-O-methyltransferase peripheral (COMT) inhibitor. It is used as an adjunct inhibitor to levodopa/dopa-decarboxylase therapy for the symptomatic treatment of Parkinsonian syndromes or for those end-of-dose' deterioration. experiencing Pharmacokinetics: Absorption: Rapidly absorbed from the GI tract. Peak plasma concentration: within 2 hr. Absolute bioavailability 65% Food delays and decreases the absorption. Distribution: Protein-binding: >99% (mainly albumin). Not widely distributed into body tissues. Metabolism: Extensively metabolised, mainly by con gation to inactive