Key takeaways
Tolcapone (Tasmar) and Sinemet (carbidopa/levodopa) are both used to treat Parkinson's disease (PD), but they have some key differences. Sinemet is a first-choice treatment option that can be taken alone, while Tolcapone is an add-on medication used when carbidopa/levodopa alone isn't effective. Sinemet combines carbidopa and levodopa to increase dopamine levels in the brain, helping to relieve PD symptoms. Tolcapone, on the other hand, is a COMT inhibitor that stabilizes levodopa levels when taken with Sinemet. Sinemet is available in multiple forms, including immediate-release and extended-release tablets. Tolcapone must be taken three times a day and has significant risks, including serious liver damage, which requires regular monitoring. Both medications can cause sleepiness and sudden sleep episodes, but Tolcapone can also cause liver failure and muscle damage.
