Parkinson's Disease and Seizure Risk

Parkinson's disease itself does not directly cause seizures in most people. However, seizures can occur in people with Parkinson's, and they are usually linked to the medications used to treat the disease rather than the disease itself. The risk is real but not common — seizures happen in a small percentage of people with Parkinson's, and understanding when and why they occur helps you and your doctor watch for warning signs.

The confusion often arises because both Parkinson's and seizures involve the brain and nervous system. But they affect different parts of the brain and work through different mechanisms. A seizure is a sudden burst of electrical activity in the brain that causes involuntary movements, loss of consciousness, or other symptoms. Parkinson's involves the loss of dopamine-producing cells in a specific brain region. One does not automatically lead to the other.

Key Takeaways

  • Parkinson's disease itself rarely causes seizures, but certain Parkinson's medications — particularly levodopa at high doses — can lower the seizure threshold and make seizures more likely.
  • People with Parkinson's who also have other brain conditions, a history of stroke, or a family history of seizures face higher seizure risk than those with Parkinson's alone.
  • Seizure warning signs include sudden jerking movements, loss of consciousness, confusion, or staring spells that come on without warning.
  • Tell your doctor when ready if you experience a seizure or suspect one, because the cause matters — it may be medication-related and changeable.
  • Your doctor may adjust your Parkinson's medication, add seizure prevention medication, or investigate other causes if seizures develop.

How Parkinson's Medications Can Increase Seizure Risk

Levodopa (also called L-dopa) is the most effective medication for Parkinson's motor symptoms, but at higher doses it can lower the threshold for seizures. This means your brain becomes more prone to the sudden electrical misfiring that causes a seizure. The risk is dose-dependent — higher doses carry higher risk — and it is one reason your doctor monitors your levodopa dose carefully and adjusts it to the lowest amount that controls your symptoms.

Other Parkinson's medications can also play a role. Dopamine agonists (medications that mimic dopamine), amantadine, and anticholinergic drugs have all been associated with seizures in some people, though the risk is lower than with levodopa. If you develop seizures after starting or increasing a Parkinson's medication, your doctor may switch you to a different drug, lower the dose, or add a seizure-prevention medication to your regimen.

Other Conditions That Raise Your Seizure Risk

If you have Parkinson's and another brain condition, your seizure risk goes up. People with both Parkinson's and a history of stroke, brain injury, or dementia are at higher risk than those with Parkinson's alone. A family history of seizures or epilepsy also matters — if your parents or siblings have had seizures, you may inherit a tendency toward them.

Infections, very low blood sugar, sleep deprivation, and stress can all trigger seizures in people whose brains are already vulnerable. If you have Parkinson's and any of these other risk factors, mention them to your doctor so they can monitor you more closely and adjust your treatment plan if needed.

What a Seizure Looks Like and When to Seek Care

Seizures take different forms. A generalized tonic-clonic seizure (the most recognizable type) involves sudden loss of consciousness, rigid muscle tension, then jerking movements, often lasting one to two minutes. You may bite your tongue, lose bladder control, or be confused and exhausted afterward. A focal seizure may cause jerking in one arm or leg, staring, lip smacking, or repetitive movements without loss of consciousness.

Call 911 or your local emergency number if someone has a seizure lasting more than five minutes, multiple seizures in a row, or a seizure followed by difficulty breathing or chest pain. If this is your first seizure, seek emergency care even if it stops quickly — your doctor needs to know what happened and why. If you have had seizures before and your doctor has given you a seizure action plan, follow it. After any seizure, contact your neurologist or Parkinson's doctor the same day or the next morning to report what happened.

Diagnosis and Testing When Seizures Occur

If you have a seizure, your doctor will ask detailed questions: What were you doing when it started? Did you lose consciousness? How long did it last? What did your movements look like? They will also review your medications, recent changes to your Parkinson's treatment, sleep, stress, and any other illnesses or injuries.

Your doctor may order an electroencephalogram (EEG), which records electrical activity in your brain and can show patterns typical of seizures. An MRI or CT scan may be done to rule out stroke, tumor, or other structural problems. Blood tests check for infection, low blood sugar, or medication levels. These tests help your doctor determine whether the seizure was caused by your Parkinson's medication, another medical condition, or something else entirely — and that answer shapes your treatment.

Treatment Options If You Have Seizures

If your seizure was triggered by a Parkinson's medication, your doctor's first step is usually to adjust that medication — lowering the dose, switching to a different drug, or spacing doses differently. This alone may stop the seizures. If seizures continue or if the cause is not medication-related, your doctor may prescribe a seizure-prevention medication (also called an anticonvulsant or antiepileptic drug). Common choices include levetiracetam, valproic acid, or lamotrigine.

The goal is to prevent future seizures while keeping your Parkinson's symptoms controlled. This sometimes requires balancing act — your doctor may need to adjust both your Parkinson's and seizure medications to find a combination that works. You will likely have follow-up appointments to monitor how you are doing, check medication levels, and watch for side effects. If seizures stop and stay stopped for a period of time, your doctor may eventually reduce or stop the seizure medication, but that decision is made case by case.

Questions to Ask Your Doctor

If you have Parkinson's and are concerned about seizure risk, or if you have had a seizure, bring these questions to your next appointment:

  • Based on my Parkinson's medications and my overall health, what is my seizure risk?
  • What are the warning signs I should watch for?
  • If I have a seizure, what should I do and who should I call?
  • Are there changes to my current medications that might lower my seizure risk?
  • If I develop seizures, would you add a seizure-prevention medication, and what side effects might it have?
  • How often should I see you to monitor for seizures or medication changes?

Frequently Asked Questions

Does everyone with Parkinson's eventually get seizures?

No. Most people with Parkinson's never have a seizure. Seizures occur in a small percentage of people with Parkinson's, usually in those taking high doses of levodopa or those with other brain conditions. Your individual risk depends on your medications, your other health conditions, and your family history.

Can I tell the difference between a Parkinson's tremor and a seizure?

Yes. A Parkinson's tremor is a rhythmic shaking you can usually control or reduce by moving or concentrating. A seizure is involuntary, comes on suddenly without warning, and often involves loss of consciousness or confusion. If you are unsure whether something was a seizure, describe it to your doctor — they can help you tell the difference.

If I have a seizure, does that mean my Parkinson's is getting worse?

Not necessarily. A seizure usually means your medication needs adjustment or that another medical condition needs attention — it does not mean your Parkinson's itself has progressed. Your doctor will investigate the cause and adjust your treatment plan accordingly.

What should I do if I am alone when I have a seizure?

If possible, move to a safe place away from hard furniture or stairs before a seizure starts. If you cannot, try to protect your head. After the seizure, call 911 or a trusted contact. Consider wearing a medical alert bracelet that says you have Parkinson's and seizures, so emergency responders know your history.

Can seizure medications interfere with my Parkinson's treatment?

Some seizure medications can affect Parkinson's symptoms or interact with your Parkinson's drugs. This is why your neurologist or Parkinson's specialist should manage both conditions together. Tell all your doctors about every medication you take, and ask specifically about interactions when a new drug is added.