"The US Food and Drug Administration (FDA) has approved an extended-release capsule formulation of carbidopa-levodopa (Rytary, IPX066, Impax Pharmaceuticals) for the treatment of Parkinson's disease (PD), postencephalitic parkinsonism, an"...
Comtan's effectiveness has not been systematically evaluated in patients with Parkinson's disease who do not experience end-of-dose “wearing-off”.
DOSAGE AND ADMINISTRATION
The recommended dose of Comtan (entacapone) is one 200 mg tablet administered concomitantly with each levodopa and carbidopa dose to a maximum of 8 times daily (200 mg x 8 = 1,600 mg per day). Clinical experience with daily doses above 1,600 mg is limited.
Comtan should always be administered in association with levodopa and carbidopa. Entacapone has no antiparkinsonian effect of its own.
In clinical studies, the majority of patients required a decrease in daily levodopa dose if their daily dose of levodopa had been greater than or equal to 800 mg or if patients had moderate or severe dyskinesia before beginning treatment.
To optimize an individual patient's response, reductions in daily levodopa dose or extending the interval between doses may be necessary. In clinical studies, the average reduction in daily levodopa dose was about 25% in those patients requiring a levodopa dose reduction. (More than 58% of patients with levodopa doses above 800 mg daily required such a reduction.)
Comtan can be combined with both the immediate and sustained-release formulations of levodopa and carbidopa.
Comtan may be taken with or without food (see CLINICAL PHARMACOLOGY).
Patients With Impaired Hepatic Function
Patients with hepatic impairment should be treated with caution. The AUC and Cmax of entacapone approximately doubled in patients with documented liver disease, compared to controls. However, these studies were conducted with single-dose entacapone without levodopa and dopa decarboxylase inhibitor coadministration, and therefore the effects of liver disease on the kinetics of chronically administered entacapone have not been evaluated (see CLINICAL PHARMACOLOGY, Pharmacokinetics of Entacapone).
Withdrawing Patients from Comtan
Rapid withdrawal or abrupt reduction in the Comtan dose could lead to emergence of signs and symptoms of Parkinson's disease (see CLINICAL PHARMACOLOGY, Clinical Studies), and may lead to hyperpyrexia and confusion, a symptom complex resembling NMS (see PRECAUTIONS, Other Events Reported With Dopaminergic Therapy). This syndrome should be considered in the differential diagnosis for any patient who develops a high fever or severe rigidity. If a decision is made to discontinue treatment with Comtan, patients should be monitored closely and other dopaminergic treatments should be adjusted as needed. Although tapering Comtan has not been systematically evaluated, it seems prudent to withdraw patients slowly if the decision to discontinue treatment is made.
Comtan (entacapone) is supplied as 200 mg film-coated tablets for oral administration. The oval-shaped tablets are brownish-orange, unscored, and embossed “Comtan” on one side. Tablets are provided in HDPE containers as follows:
Bottles of 100…………………………...NDC 0078-0327-05
Store at 25°C (77°F); excursions permitted to 15°C to 30°C (59°F to 86°F). [See USP Controlled Room Temperature.]
Comtan (entacapone) tablets are manufactured by Orion Corporation, Orion Pharma (Espoo, Finland) and marketed by Novartis Pharmaceuticals Corporation (East Hanover, N.J. 07936, U.S.A.). Revised: July 2014
Last reviewed on RxList: 1/29/2015
This monograph has been modified to include the generic and brand name in many instances.
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