Head-to-head comparisons of medication uses, side effects, warnings, and more.
Key takeaways
Tolcapone (Tasmar) and ropinirole are both medications used to treat Parkinson's disease (PD), but they work in different ways and have distinct uses. Tolcapone is a catechol-O-methyltransferase (COMT) inhibitor that helps stabilize levodopa levels in the brain, and it must be used with carbidopa/levodopa. It can cause serious liver damage, requiring regular liver monitoring. Ropinirole, on the other hand, is a dopamine agonist that mimics dopamine in the brain. It can be used alone for PD and also treats restless legs syndrome (RLS). Ropinirole can cause impulsive behaviors, and it should not be stopped suddenly due to withdrawal risks. While both medications can cause dizziness and hallucinations, tolcapone can also cause liver damage.
Tolcapone (Tasmar)
Ropinirole
Tolcapone (Tasmar)
Ropinirole
Summary of Tasmar vs. Requip
Summary for COMT inhibitor
Prescription only
Tolcapone (Tasmar) is an oral add-on medication for Parkinson's disease (PD). It's usually used when carbidopa/levodopa isn't controlling PD symptoms well enough.
Summary for Dopamine agonist
Prescription only
Ropinirole is a dopamine agonist that's used to treat Parkinson's disease (PD) and restless legs syndrome (RLS) in adults. For Parkinson's disease, the immediate-release tablets are taken by mouth three times per day, and the extended-release tablets are taken once per day. Ropinirole side effects include nausea, sleepiness, and dizziness.
Indications of Tasmar vs. Requip
Indications for
•Parkinson's disease (PD); as add-on treatment to carbidopa/levodopa