Comtan is made by Orion Corporation, Inc. and marketed by Novartis Pharmaceuticals Corporation.
Comtan is always used in combination with carbidopa and levodopa; it has no effects against Parkinson's disease when used alone. It works by increasing blood levels of levodopa and helping it last longer in the body. The medication works by inhibiting an enzyme known as catechol-O-methyltransferase (COMT) that breaks down levodopa before it has a chance to reach the brain.
In clinical studies, Comtan plus carbidopa-levodopa has been shown to be more effective than just carbidopa-levodopa for Parkinson's treatment. In these studies, people who were experiencing wearing-off fluctuations of their carbidopa-levodopa therapy were given either Comtan or a placebo (a "sugar pill" with no active ingredient) to take with each dose of their carbidopa-levodopa. These studies showed that Comtan helped carbidopa-levodopa work longer, with shorter "off" periods (when the medication did not work well) and longer "on" periods (when the medication worked well).
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