# Epilepsy in Cats: Treatment and Seizure Medication Options Epilepsy in cats treatment centers on daily anti-seizure medication that reduces how often seizures happen and how severe they are. Phenobarbital is the most common first choice, and other drugs can be added if seizures continue. Most cats with epilepsy can be managed well, though treatment is usually lifelong. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## Quick Answer - Phenobarbital is the most widely used first-line medication for cats with recurrent seizures, and it can be given once daily in many cases [1]. - Zonisamide is a common add-on or alternative when phenobarbital does not control seizures well enough or causes problems [2]. - Your veterinarian sets the dose based on your cat's weight, health, and response, then adjusts it using blood tests over time. - Seizure control means fewer and milder seizures, not always zero seizures. Complete remission happens in some cats but not all [1][3]. - Never stop or change seizure medication on your own. Sudden withdrawal can trigger severe, prolonged seizures. ## What Is Epilepsy in Cats? A seizure is a burst of abnormal, excessive electrical activity in the brain. It can look like collapsing, paddling, twitching, drooling, or a period of confusion [4]. Epilepsy is a brain disorder that makes a cat prone to repeated seizures. Veterinarians generally call it epilepsy when a cat has two or more unprovoked seizures more than 24 hours apart [4]. Epilepsy affects roughly 1% to 2% of the cat population, which makes it one of the most common neurologic problems in cats [5]. It is more common than many owners realize. Seizures are grouped by cause. Idiopathic epilepsy means no underlying brain disease or metabolic problem is found. Structural epilepsy means a brain lesion such as inflammation, a tumor, or scar tissue is present. Reactive seizures are triggered by something outside the brain, like a toxin or a metabolic upset [6]. ## Signs Owners Notice Seizure signs in cats vary a lot. Some cats have full-body (generalized) seizures. Others have focal seizures that affect one part of the body or cause unusual behavior. Generalized tonic-clonic seizures were the most common type in one group of cats, seen in about 83% of cases [6]. During these, a cat may fall over, stiffen, paddle the legs, drool, urinate, or defecate. Other signs you might see: - Staring, twitching, or facial movements - Sudden collapse or loss of consciousness - Salivation, vomiting, or vocalizing - Pacing, hiding, or acting "off" before or after a seizure - Confusion, blindness, or wobbliness for minutes to hours afterward Some cats have cluster seizures, which means two or more seizures within 24 hours. Others have status epilepticus, a seizure that lasts a long time or repeats without recovery. In one study of 118 cats, single generalized seizures and cluster seizures happened at nearly equal rates, while status epilepticus was less common [7]. Cluster seizures and status epilepticus are emergencies. They need treatment right away. ## Causes and Risk Factors The cause matters because it changes treatment. Your veterinarian will sort seizures into one of three groups [6]. **Idiopathic epilepsy.** No structural brain disease or metabolic trigger is found. This was the most common diagnosis in several cat studies, accounting for about 80% of cases where a cause was identified in one report [7] and about 42% in another [6]. It often starts in middle age. **Structural epilepsy.** A problem inside the brain is found, such as inflammation, infection, stroke, or a tumor. This is more likely in older cats or cats with other neurologic signs. **Reactive seizures.** These come from something outside the brain, like a toxin, low blood sugar, liver or kidney disease, or an electrolyte problem. Treating the underlying issue may stop the seizures. Age, sex, and body weight did not clearly predict seizure type in one study of cats with epilepsy [7]. Any cat can develop seizures. ## How Epilepsy Is Diagnosed Diagnosis starts with a full history. Your veterinarian will ask what the seizure looked like, how long it lasted, and how often it happens. Video recordings from your phone are extremely helpful. Next comes a physical and neurologic exam. Blood work and a urinalysis check for metabolic causes like liver or kidney disease, low blood sugar, or electrolyte problems. If those tests are normal, your veterinarian may recommend brain imaging (MRI) and sometimes a spinal fluid tap to look for structural causes. These tests help confirm idiopathic epilepsy and rule out other problems. In some cases, an electroencephalogram (EEG) can help classify the seizure type more precisely, especially when the diagnosis is unclear or seizures are hard to control [5]. Not every practice offers this, so your veterinarian may refer you to a specialist. For a deeper look at the testing process, see [Feline Epilepsy: Diagnostic Approach and Treatment](/knowledge/veterinary-medicine/clinical-internal-medicine/feline-epilepsy-diagnostic-approach-treatment). ## Epilepsy in Cats Treatment: Medication Options Treatment usually starts when seizures are frequent, severe, or clustered. A single mild seizure may not need medication right away. Your veterinarian will weigh seizure frequency, severity, and your cat's quality of life. ### Phenobarbital for Cats With Seizures Phenobarbital is the most common first-line medication for cats with recurrent seizures. It is a daily anticonvulsant that reduces seizure frequency and severity. The traditional schedule is every 12 hours, but once-daily dosing is being studied and used. In one study of nine cats with presumptive idiopathic epilepsy, once-daily oral phenobarbital produced seizure remission in 88% of the cats and good control in the remaining cat, at a mean dose of 2.6 mg/kg once daily [1]. No cat needed a dose frequency increase over an average follow-up of 3.5 years, and none showed side effects or compliance problems at the last check [1]. That does not mean every cat can take it once daily. Your veterinarian will decide the dose and schedule based on your cat. Never adjust the dose yourself. Common side effects include sleepiness, wobbliness, and increased appetite or thirst. Many of these ease after the first few weeks. Long-term use can affect the liver, so periodic blood work is standard. For a fuller list, read [What Are the Side Effects of Seizure Medication in Cats?](/knowledge/veterinary-medicine/pet-medication-guide/seizure-medication-side-effects-cats). ### Zonisamide as an Add-On or Alternative Zonisamide is often used when phenobarbital alone does not control seizures, or when phenobarbital causes problems. It can be used alone or combined with other drugs. In a study of 57 cats, zonisamide reduced seizures by a median of about one seizure per month and one seizure day per month across all cats [2]. Some cats improved more than others. Zonisamide is generally well tolerated, but it can cause sleepiness, appetite changes, or digestive upset. Your veterinarian will monitor blood work. ### Other Medications Other drugs may be used alone or in combination, depending on the cat: - **Levetiracetam** is sometimes used as an add-on, and it is also used in emergency settings. - **Diazepam** can be used for emergency seizure control and sometimes as an add-on. In one report, cats on combinations that included diazepam often reached treatment goals [3]. - **Clonazepam** can be given by mouth as a pulse treatment for cluster seizures in animals that have recovered enough to swallow after the first seizure [8]. Combination therapy is common when one drug is not enough. In one study, eight cats received combination therapy, and most reached their seizure-control goals [3]. ### Emergency Treatment For a seizure happening right now, veterinarians use injectable medications. Diazepam can be given as an intravenous bolus and repeated up to three times at 5 to 10 minute intervals [8]. If seizures continue after that, a continuous infusion may work better, and a maintenance anticonvulsant such as intravenous phenobarbital should be started to prevent more seizures [8]. If your cat is having a seizure that will not stop, this is an emergency. For guidance on what to do in the moment, see [What to Do If Your Cat Has a Seizure: Medication and Emergency Response](/knowledge/veterinary-medicine/pet-medication-guide/cat-seizure-emergency-response). ### How Dosing and Monitoring Work Your veterinarian calculates the dose from your cat's weight, overall health, and response to treatment. Doses are not one-size-fits-all. Monitoring usually includes: - **Blood levels.** Phenobarbital levels can be measured to keep the drug in a range that controls seizures without causing toxicity. This is called therapeutic drug monitoring. Learn more in [Therapeutic Monitoring of Antiepileptic Drugs in Dogs and Cats](/knowledge/veterinary-medicine/veterinary-pathology-microbiology/therapeutic-monitoring-antiepileptic-drugs-dogs-cats). - **Blood work.** Liver and kidney values are checked regularly, especially on phenobarbital. - **Seizure diary.** Track every seizure: date, time, length, and what it looked like. This is one of the most useful things you can do. - **Dose adjustments.** Your veterinarian may raise, lower, or split the dose based on seizure control and side effects. | Medication | Typical role | What owners should know | |---|---|---| | Phenobarbital | First-line daily treatment | Can be given once daily in some cats [1]. Needs periodic blood work. | | Zonisamide | Add-on or alternative | Reduced seizures by a median of about one per month in one study [2]. | | Levetiracetam | Add-on, sometimes emergency use | Often combined with other drugs. | | Diazepam | Emergency and add-on use | Used in combinations that helped some cats reach goals [3]. | | Clonazepam | Pulse treatment for cluster seizures | Given by mouth after the cat can swallow [8]. | ## Recovery, Outlook, and Long-Term Management Most cats with epilepsy can have a good quality of life with treatment. Complete seizure remission happens in some cats, and good control happens in others [1][3]. One study found that nine cats treated with phenobarbital alone reached a goal of fewer than one seizure every three months, and three cats treated with zonisamide alone had two reach that goal [3]. Results vary from cat to cat. A small number of cats have drug-resistant epilepsy, meaning seizures continue despite appropriate medication [5]. These cats may need referral to a neurologist, additional testing, or different drug combinations. For more on this, see [Feline Refractory Seizures: Diagnosis and Management](/knowledge/veterinary-medicine/clinical-methods/feline-refractory-seizures-diagnosis-management). Long-term management includes: - Giving medication at the same time every day - Keeping a seizure diary - Regular veterinary visits and blood work - Watching for side effects and reporting them - Avoiding missed doses, which can trigger seizures Never stop seizure medication suddenly. Withdrawal can cause severe seizures, including status epilepticus. ## Prevention You cannot always prevent epilepsy, but you can lower some risks and improve outcomes. - **Avoid known toxins.** Keep medications, plants, and chemicals out of reach. - **Treat underlying disease.** Managing liver, kidney, or metabolic problems can prevent reactive seizures. - **Stick to the medication schedule.** Consistency is one of the biggest factors in seizure control. - **Reduce stress.** Stress does not cause epilepsy, but it can sometimes trigger seizures in prone cats. - **Keep your cat indoors.** This lowers the risk of trauma and toxin exposure. ## Limitations and When to Contact a Veterinarian No article can replace an exam and testing for your individual cat. Seizure causes, medication choices, and doses must be decided by a veterinarian who knows your cat. **Contact a veterinarian the same day if:** - Your cat has a seizure and you have not yet had a diagnosis - Seizures are happening more often or lasting longer than before - Your cat seems confused, wobbly, or not themselves for hours after a seizure - You see new side effects from medication, such as severe sleepiness, vomiting, or loss of appetite **Go to an emergency clinic now if:** - A seizure lasts more than a few minutes - Seizures keep coming without your cat recovering in between - Your cat has trouble breathing, collapses, or does not wake up - Your cat has more than one seizure in 24 hours (cluster seizures) **Schedule a routine visit if:** - Your cat is stable but due for blood work - You are having trouble giving medication - You want to discuss whether the dose or drug should change If you think your cat ate something toxic, call your veterinarian or a pet poison hotline right away. ## Frequently Asked Questions ### Can epilepsy in cats be cured? Most cases cannot be cured, but they can be managed. Treatment aims to reduce how often seizures happen and how severe they are. Some cats go into remission, meaning they stop having seizures for long periods. ### Is phenobarbital safe for cats long term? Phenobarbital is widely used and can be safe long term with monitoring. It can affect the liver, so your veterinarian will check blood work regularly. Report any new sleepiness, wobbliness, or appetite changes. ### What if my cat keeps having seizures on medication? Your veterinarian may adjust the dose, add a second drug, or switch medications. Some cats need combination therapy to reach good control. If seizures continue despite treatment, referral to a neurologist may help. ### Can I give my cat medication only when it has a seizure? No. Daily seizure medications work by keeping a steady level in the body. Giving them only after a seizure does not prevent the next one. Emergency medications are different and are used for seizures happening right now. ### Will my cat need medication for life? In most cases, yes. Epilepsy is usually a lifelong condition, and stopping medication can bring seizures back. Your veterinarian may adjust the plan over time, but do not stop treatment without guidance. ## Related Articles - [What Are the Side Effects of Seizure Medication in Cats?](/knowledge/veterinary-medicine/pet-medication-guide/seizure-medication-side-effects-cats) - [Feline Epilepsy: Diagnostic Approach and Treatment](/knowledge/veterinary-medicine/clinical-internal-medicine/feline-epilepsy-diagnostic-approach-treatment) - [What to Do If Your Cat Has a Seizure: Medication and Emergency Response](/knowledge/veterinary-medicine/pet-medication-guide/cat-seizure-emergency-response) - [Therapeutic Monitoring of Antiepileptic Drugs in Dogs and Cats](/knowledge/veterinary-medicine/veterinary-pathology-microbiology/therapeutic-monitoring-antiepileptic-drugs-dogs-cats) - [Feline Refractory Seizures: Diagnosis and Management](/knowledge/veterinary-medicine/clinical-methods/feline-refractory-seizures-diagnosis-management) - [Canine Epilepsy: Diagnosis and Antiepileptic Drug Management](/knowledge/veterinary-medicine/clinical-methods/canine-epilepsy-diagnosis-antiepileptic-management) ## References 1. [Once-a-day oral treatment with phenobarbital in cats with presumptive idiopathic epilepsy](https://pubmed.ncbi.nlm.nih.gov/37747329/). Journal of feline medicine and surgery, 2023. 2. [A retrospective study of the efficacy of zonisamide in controlling seizures in 57 cats](https://pubmed.ncbi.nlm.nih.gov/38240116/). Journal of veterinary internal medicine, 2024. 3. [Evaluation of antiseizure medications including zonisamide in feline idiopathic epilepsy at a referral hospital in Japan](https://pubmed.ncbi.nlm.nih.gov/37614732/). Open veterinary journal, 2023. 4. [Epilepsy in Small Animals - Nervous System](https://www.merckvetmanual.com/nervous-system/epilepsy-in-small-animals/epilepsy-in-small-animals). Merck Veterinary Manual. 5. [Case Report: Generalized motor tonic seizures characterized by paroxysmal fast activity on EEG in a Tonkinese cat](https://pubmed.ncbi.nlm.nih.gov/41036538/). Frontiers in veterinary science, 2025. 6. [Semiological and etiological classification of seizures in cats and dogs: 53 cases](https://pubmed.ncbi.nlm.nih.gov/41423247/). The Journal of veterinary medical science, 2026. 7. [Clinical and Diagnostic Features of Feline Epilepsy: Distribution of Seizure Types and Associated Factors](https://pubmed.ncbi.nlm.nih.gov/41375554/). Animals : an open access journal from MDPI, 2025. 8. [Anticonvulsants for Emergency Treatment of Seizures in Dogs and Cats - Pharmacology](https://www.merckvetmanual.com/pharmacology/systemic-pharmacotherapeutics-of-the-nervous-system/anticonvulsants-for-emergency-treatment-of-seizures-in-dogs-and-cats). Merck Veterinary Manual. ## Further Reading - [American Veterinary Medical Association: First Aid Tips for Pet Owners](https://www.avma.org/resources-tools/pet-owners/emergencycare/first-aid-tips-pet-owners) - [Merck Veterinary Manual: Cat Owners](https://www.merckvetmanual.com/cat-owners) - [Cornell Feline Health Center: Health Information](https://www.vet.cornell.edu/departments-centers-and-institutes/cornell-feline-health-center/health-information)