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Tasmar is a prescription medicine used in combination with other medicines like carbidopa and levodopa to treat symptoms of Parkinson’s disease in adults. Parkinson’s disease is a long-term neurological condition that causes tremors, stiffness, slowed movement, and muscle control problems. Tasmar slows how quickly levodopa is broken down, helping it stay active longer and reducing “off” periods when symptoms return. Tasmar does not work on its own and must be taken with carbidopa and levodopa.
Tasmar is FDA-approved for people who:
| Brand Name | Tasmar |
|---|---|
| Generic Name | Tolcapone |
| Drug Class | COMT (Catechol‑O‑Methyltransferase) inhibitor |
| Route | Oral (tablets) |
| Available Strengths | 100 mg and 200 mg (the latter dosing is used clinically, but may be limited in market availability) |
| Prescription Required | Yes |
| Status | FDA-approved |
| Used For | Parkinson’s disease, used with levodopa/carbidopa to reduce “off” periods |
| Typical Dose | 100 mg three times daily, with each carbidopa/levodopa dose |
| How It Works | Slows the breakdown of levodopa to extend its effectiveness and reduce motor fluctuations |
| Common Side Effects | Nausea, diarrhea, dizziness, sleepiness, loss of appetite, abnormal movements (dyskinesia) |
| Serious Side Effects | Liver injury (requires regular liver function monitoring), allergic reactions, severe muscle breakdown (rhabdomyolysis), worsening Parkinson’s symptoms |
| Black Box Warning | Risk of potentially fatal liver failure |
| Precautions | Monitor liver function, avoid in active liver disease, use cautiously with other medications, may cause drowsiness or dizziness |
| Pregnancy/Breastfeeding | Safety not established; discuss with the doctor |
| Missed Dose | Take as soon as you remember, unless your next dose is due soon; do not double up |
| Storage | Store at room temperature and out of reach of children |
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Tasmar should only be used in combination with carbidopa/levodopa therapy.
The starting Tasmar dose for adults is always 100 mg three times a day.
Tasmar Parkinson’s medication should be taken as follows:
Clinical studies show that Tasmar can increase “on” time and reduce “off” periods in patients with motor fluctuations. The medication has been studied as an add-on therapy to levodopa/carbidopa in multiple clinical trials. These FDA clinical trials, lasting 13 to 26 weeks, show that:
Tasmar (tolcapone) helps people with Parkinson’s disease by inhibiting the COMT enzyme, which normally breaks down levodopa in the body. By slowing down levodopa’s breakdown, the medication works effectively and helps reduce “off” periods when symptoms like tremors, stiffness, or slow movement return. It is always used along with levodopa/carbidopa under a doctor’s supervision.
Common Tasmar side effects are mild and may resolve on their own. If you notice any adverse reaction during your treatment, seek medical attention right away.
| Common Side Effects | Severe Side Effects | Long-Term Side Effects |
|---|---|---|
| Dyskinesia (uncontrolled movements) | Liver injury (boxed warning also) | Elevated liver enzymes early in treatment |
| Nausea | Psychotic behaviors (severe confusion/hallucinations) | Persistent or serious diarrhea |
| Diarrhea | Hypotension (low blood pressure) | Confusion or cognitive changes over time |
| Somnolence | Rhabdomyolysis (muscle breakdown) | Orthostatic complaints (feeling faint on standing) |
| Dystonia (muscle spasms) | ||
| Loss of appetite | ||
| Dizziness |
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Risk of Liver Injury:
Although Tasmar can improve Parkinson’s symptoms when used with levodopa/carbidopa, it carries significant safety risks, especially involving the liver.
Health Conditions Requiring Caution
High-Risk Groups
Get medical attention if you notice or experience:
Both Tasmar (tolcapone) and Comtan (entacapone) are COMT inhibitors used with carbidopa/levodopa to help manage “wearing-off” symptoms in Parkinson’s disease. However, their effectiveness and safety profile vary. The right choice depends on an individual’s medical conditions and the doctor’s judgment. Here’s a comparison table of Tolcapone vs Entacapone.
| Feature | Tasmar (tolcapone) | Comtan (entacapone) |
|---|---|---|
| Drug class | COMT inhibitor | COMT inhibitor |
| How it works | Blocks COMT in both the brain and peripheral tissues, extending the levodopa effect | Blocks COMT only in peripheral tissues, extending the levodopa effect |
| Use with levodopa | Must be used only with carbidopa/levodopa | Must be used only with carbidopa/levodopa |
| Typical dosing | 100 mg three times daily (some people may use 200 mg three times daily with caution) | 200 mg administered alongside each carbidopa/levodopa dose |
| Effectiveness | May provide a greater reduction in “off” time in some patients | Effective for reducing “off” time, but generally less potent than tolcapone |
| Liver safety | High risk: associated with serious liver injury, including liver failure | Low risk: no boxed warning for liver injury |
| Monitoring required | Regular liver function tests are mandatory | No routine liver monitoring required |
| Prescribed for | Patients who do not respond well to other treatments and can comply with liver monitoring | Often the first-choice COMT inhibitor due to better safety profile |
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Tasmar (tolcapone) can interact with several drugs. This is not a complete list of Tasmar interactions, so tell your doctor about all medications you are taking before starting Parkinson’s treatment:
Avoid or Use Only Under Medical Supervision
Moderate-Risk Interactions (Require Monitoring or Dose Adjustment)
Lower-Risk but Clinically Relevant Interactions
Buying Tasmar (tolcapone) in the U.S. can be extremely costly. The average Tasmar cost without insurance may range from approximately $1,000 to $8,000, depending on the pharmacy. These high out-of-pocket costs can make long-term Parkinson’s disease treatment difficult for many patients. When you order Tasmar online from Polar Bear Meds, you get Tasmar 100 mg (100 tablets) for just $241.95.
Our rates are significantly lower than typical U.S. pharmacy retail rates. This allows patients to access the same prescription medication at a substantially lower cost. Orders placed through Polar Bear Meds are typically delivered within 3–5 business days via Xpress Post. All orders require a valid prescription and are dispensed from a licensed Canadian pharmacy network, ensuring proper sourcing and pharmacy standards.z

Dr. Jackson Miller is a board-certified medicine physician & hospitalist. He is a healthcare professional with a strong background in patient care. With years of experience and a patient-first approach, he believes the foundation of good health is a patient who feels informed and empowered. He contributes to medical content review, drawing on his background in clinical practice and patient education. He focuses on presenting health information in a clear, accurate, and accessible way to help readers make informed decisions. His work emphasizes clarity, evidence-based guidance, and understandable explanations of medical topics.
Learn more about Tasmar and related topics