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Compare Entacapone vs. Sinemet

Head-to-head comparisons of medication uses, side effects, warnings, and more.

Key takeaways

Entacapone (Comtan) and Sinemet (carbidopa/levodopa) are both used to treat Parkinson's disease (PD), but they work differently. Entacapone is a COMT inhibitor that helps levodopa last longer in your body by blocking a protein that breaks it down. You must take it with each dose of carbidopa/levodopa for it to work. Sinemet, on the other hand, is a combination of carbidopa and levodopa. Levodopa turns into dopamine in your brain to relieve PD symptoms, while carbidopa prevents levodopa from breaking down before it reaches your brain. Sinemet is a first-choice option for PD and comes in various forms, including immediate-release and extended-release tablets. Entacapone and Sinemet are both available in both brand-name and generic forms. Both medications can cause side effects like involuntary movements and nausea, but Entacapone can also cause diarrhea and stomach pain. Both medications can make you very sleepy and may cause dark-colored urine, but Sinemet may also cause dark-colored sweat or saliva.

  • Entacapone (Comtan)
    Sinemet (carbidopa / levodopa)
  • Entacapone (Comtan)
    Sinemet (carbidopa / levodopa)

  • Summary of Entacapone vs. Sinemet

    Summary for COMT inhibitor
    Prescription only

    Entacapone (Comtan) is used for Parkinson's disease (PD) and helps relieve symptoms like shakiness and slowed movement. It's used along with the combination medication carbidopa/levodopa. Entacapone (Comtan) is a good option for people whose levodopa wears off before their next dose ("wearing-off" periods). But, this medication has to be taken every time you take carbidopa/levodopa for it to work properly. Some side effects include involuntary movements (dyskinesia) and nausea. Entacapone (Comtan) is available as a brand-name and generic medication.

    Summary for Dopa decarboxylase inhibitor / Dopamine replacement
    Prescription only

    Sinemet (carbidopa / levodopa) is a combination medication made up of carbidopa and levodopa. It's one of the first-choice options for Parkinson's disease (PD) to relieve symptoms, such as shakiness and slowed movement. The medication comes in many forms and strengths, but it must be taken multiple times per day in order to relieve your PD symptoms.

  • Indications of Entacapone vs. Sinemet

    Indications for
    •Relief of "wearing-off" symptoms in people with Parkinson's disease who are taking carbidopa/levodopa medications (e.g., Sinemet, Rytary)
    Indications for
    •Parkinson's disease (PD)
    •Parkinsonism (conditions that cause people to have signs and symptoms of PD, including slowness, stiffness, shakiness, and imbalance)

  • Pros and Cons of Entacapone vs. Sinemet

    Pros and Const for COMT inhibitor
    Pros
    •Helps carbidopa/levodopa relieve your PD symptoms better
    •Can be useful for people with advanced PD or people who experience "wearing-off" periods with their carbidopa/levodopa
    •Can take with or without food
    Cons
    •Must take with every dose of carbidopa/levodopa to see an effect on PD symptoms; it has no effect when it's taken alone
    •Can cause involuntary movements or other movement problems
    •Can cause nausea, especially when you first start taking the medication
    Pros and Const for Dopa decarboxylase inhibitor / Dopamine replacement
    Pros
    •First-choice option for treating PD symptoms
    •Available in many forms: immediate-release tablets, extended-release tablets, and orally disintegrating tablets
    •Available in multiple strengths, so your provider can prescribe a higher dose if needed
    •Available in a lower-cost generic form
    Cons
    •Usually needs to be taken multiple times per day to control PD symptoms
    •Can make you very sleepy and cause you to fall asleep suddenly
    •Can darken the color of your saliva, sweat, and urine
    •Might not work as well if your PD symptoms worsen

  • Common Side Effects of Entacapone vs. Sinemet

    Common Side Effects for
    •Involuntary movements (dyskinesia, 25%)
    •Nausea (14%)
    •Muscle spasms (hyperkinesia, 10%)
    •Changes in the color of your urine (10%)
    •Diarrhea (10%)
    •Slowed muscle movements (hypokinesia, 9%)
    •Stomach pain (8%)
    •Dizziness (8%)
    Common Side Effects for
    •Involuntary movements (dyskinesia or dystonia, 12-17%)
    •Nausea (6%)

  • Warnings of Entacapone vs. Sinemet

    Common Side Effects for
    •Sleepiness or falling asleep while doing daily activities
    •Low blood pressure and fainting
    •Hallucinations and changes in behavior and thoughts
    •Difficulty controlling impulsive behavior
    •Diarrhea and inflamed colon (colitis)
    •Muscle damage (rhabdomyolysis)
    •High fevers and confusion
    •Interactions with other medications
    Common Side Effects for
    •Sleepiness or falling asleep during activities
    •High fevers and confusion
    •Hallucinations and changes in behavior and thoughts
    •Difficulty controlling impulsive behavior
    •Skin cancer

  • Prices with our coupons for Entacapone vs. Sinemet

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    Learn more about Sinemet

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