COMTAN

Effect on the Pharmacokinetics of Levodopa and its Metabolites When 200 mg entacapone is administered together with levodopa and carbidopa, it increases the area under the curve (AUC) of levodopa by approximately 35% and the elimination half-life of levodopa is prolonged from 1.3 hours to 2.4 hours. In general, the average peak levodopa plasma concentration and the time of its occurrence (T max of 1 hour) are unaffected. The onset of effect occurs after the first administration and is maintained...

Clinical Studies The effectiveness of entacapone as an adjunct to levodopa in the treatment of Parkinson's disease was established in three 24-week multicenter, randomized, double-blind, placebo-controlled studies in patients with Parkinson's disease. In two of these studies, patients had motor "fluctuations", characterized by documented periods of "On" (periods of relatively good functioning) and "Off" (periods of relatively poor functioning), despite optimum levodopa therapy. There was also a withdrawal period following 6 months of treatment. In the third study, patients were not required to...

ADVERSE REACTIONS Because clinical studies are conducted under widely varying conditions, the incidence of adverse reactions (number of unique patients experiencing an adverse reaction associated with treatment per total number of patients treated) observed in the clinical studies of a drug cannot be directly compared to the incidence of adverse reactions in the clinical studies of another drug and may not reflect the incidence of adverse reactions observed in practice. A total of 1,450 patients...

CONTRAINDICATIONS Entacapone is contraindicated in patients who have demonstrated hypersensitivity to the drug or its ingredients.

Drug Interactions See PRECAUTIONS, Drug Interactions .