Cat Seizures: Causes, First Aid, and When to Go to a 24-Hour Clinic

"My cat suddenly fell onto its side, its legs stiff and kicking, its mouth foaming, and its body convulsed for about a minute, that's a seizure, right? What should I do?" Watching a cat have a seizure for the first time is terrifying. The first reaction is usually to panic, try to hold it down, or put a hand in its mouth, all of which are wrong and actually dangerous for both you and the cat.

This article covers the difference between a seizure and other conditions that look similar in cats, the three seizure phases that are often missed, the causes specific to cats (which differ from dogs, especially regarding poisoning and senior kidney disease), the correct first aid steps at home, and when this condition becomes an emergency that must be taken to a 24-hour clinic immediately.

What is a seizure in cats

A seizure is sudden abnormal electrical activity in the brain. In cats it usually appears as uncontrolled body movements, legs twitching or kicking rhythmically (paddling), a stiff body, the head pulled back, foaming at the mouth, dilated pupils, sometimes involuntary urination or defecation, and partial or total loss of consciousness.

Before concluding your cat had a seizure, it is important to distinguish it from two other conditions that are often confused:

• Syncope (fainting), the cat suddenly goes limp and collapses, usually during activity or stress, then recovers within seconds without a long phase of confusion. It is relatively rarer in cats than in dogs; the root cause is usually the heart (hypertrophic cardiomyopathy, HCM, often in Maine Coon, Ragdoll, Persian breeds).
• Tremor, shaking of a specific body part (head, leg, tail) without loss of consciousness. The cat is still aware, still responds to its name, still makes eye contact. It can be due to cold, pain, anxiety, or a specific neurological disorder (congenital cerebellar hypoplasia).
• A true seizure, there is a phase of loss of consciousness, uncontrolled stereotyped movements (similar between episodes), and a post-seizure recovery phase with confusion and disorientation.

If you can record a video during the event, it greatly helps the vet distinguish these three conditions. Many seizure vs syncope vs tremor diagnoses in cats are actually established from a video the owner brings, because often by the time the cat arrives at the clinic it has already recovered and shows no symptoms at all.

The three seizure phases in cats

A seizure is not a single event, there are three phases, and each is relevant to report to the vet. In cats, these phases can be subtler and shorter than in dogs, so they are easy to miss:

1. Pre-ictal (before the seizure), minutes to hours

• The cat appears restless, vocalises unusually (long meowing or whining), paces aimlessly
• Seeks out the owner or conversely hides in an unusual place
• Drools excessively, licks its lips repeatedly
• Dilated pupils, a momentary "blank" expression
• Many owners only notice this phase after several recurring seizures when they see the same pattern

2. Ictal (during the seizure), usually 30 seconds to 2 minutes

• The cat falls or lies on its side, losing consciousness
• The body stiffens (tonic phase) then the legs move rhythmically (clonic / paddling phase)
• The mouth often foams, the tongue may be bitten (a little blood in the mouth is common)
• Pupils very dilated (mydriasis), eyes "blank" or rolling
• Involuntary urination and/or defecation, often shocking to owners, but this is normal during a seizure
• In cats there is also a focal seizure form, twitching of one side of the face, an ear, or just one leg, with the cat sometimes still somewhat aware. This form is often missed because it is not dramatic

3. Post-ictal (after the seizure), minutes to hours

• The cat appears confused, disoriented, not recognising its surroundings or owner
• May appear temporarily blind (bumping into furniture)
• Weak, staggering, struggling to stand steadily
• Some cats sleep a long time after a seizure, some become aggressive or extremely frightened (hissing at their own owner, not out of anger, but out of disorientation)
• This phase can last from 5 minutes to several hours

Recording the duration of each phase + the total episode duration is the most valuable information for the vet. Use a phone timer, when the seizure starts, check the clock, start the stopwatch.

Causes of cat seizures, what is specifically different from dogs

A seizure is a symptom, not a disease. The causes in cats have several unique characteristics that often differ from dogs, especially regarding poisoning and kidney disease in seniors:

1. Idiopathic epilepsy, relatively rarer than in dogs

• In cats, idiopathic epilepsy (recurrent seizures with no structural/metabolic cause found) is rarer than in dogs
• Most recurrent seizures in cats have a traceable cause, especially structural (tumour, inflammation) or metabolic
• That is why a complete diagnostic workup is important in a cat that has seizures, do not immediately label it "epilepsy" without a workup

2. Poisoning, some toxins are especially dangerous to cats

This is an area where cats are very different from dogs. Cats have a liver that is less efficient at metabolising certain chemicals, so many things that are safe/borderline for dogs are highly toxic to cats:

• Permethrin and other pyrethroids, the active ingredient in many dog flea products (spot-on, spray, collars). Applying a dog flea product to a cat = severe acute poisoning with seizures. This is one of the most common causes of acute seizures in cats in Indonesia, owners who have both a dog and a cat sometimes do not realise dog flea products are prohibited for cats.
• Lily (all Lilium and Hemerocallis species), lily flowers are highly toxic to cats. A cat that bites a leaf or licks the pollen = acute kidney damage + can trigger seizures via uremia. Avoid all lily plants in a home with a cat.
• Antifreeze / car coolant (ethylene glycol), it tastes sweet, and cats sometimes lick drips off the garage floor. Highly toxic, causes acute kidney failure + acidosis + seizures within 12-24 hours. Often fatal if treatment is delayed.
• Paracetamol (acetaminophen), cats are extremely sensitive. A single 500 mg tablet can be fatal. Signs: depression, methemoglobinemia (bluish gums), facial edema, seizures.
• Tea tree oil and other essential oils, cats cannot metabolise phenols; topical application or a high-concentration diffuser = toxic, can cause seizures.
• Household pesticides, organophosphates, carbamates.
• Heavy metals, lead from old paint, human eye drops containing tetrahydrozoline.

3. Hepatic encephalopathy

• Toxins (especially ammonia) build up in the blood because the liver cannot clear them
• In cats this is often caused by a congenital portosystemic shunt (especially in kittens of certain breeds, Persian, Himalayan), hepatic lipidosis (fatty liver after prolonged anorexia), or chronic liver disease
• Signs: seizures after eating, excessive drooling, behaviour changes, ataxia

4. Hypoglycemia, common in small kittens

• Small-breed kittens that fast too long (>4-6 hours) can drop their blood sugar to a level that triggers a seizure
• Also in diabetic cats that overdose on insulin
• Early signs: weakness, ataxia, drooling, then seizures

5. Hypertensive encephalopathy, common in seniors with CKD

• Senior cats with chronic kidney disease (CKD) often develop secondary hypertension
• High systolic blood pressure (often >180 mmHg) can trigger damage to the brain's blood vessels and cerebral edema → seizures
• Often accompanied by other signs: sudden blindness (retinal detachment), behaviour changes, ataxia
• This is a common cause of first-time seizures in cats >10 years old, and is often missed because owners focus on the CKD symptoms
• Blood pressure measurement is mandatory in all senior cats with a first-time seizure

6. Structural brain disease, especially in seniors

• Meningioma, the most common brain tumour in senior cats, often slow-growing. Signs: a new first-time seizure in a cat >10 years old, often accompanied by subtle behaviour changes (getting lost in its own home, new aggression, missing the litter box)
• Feline infectious peritonitis (FIP) neurological form, often in young cats, can trigger seizures as part of FIP encephalitis
• Toxoplasmosis, a parasitic infection that can attack the central nervous system
• Head trauma, a fall from height (high-rise syndrome in Jakarta apartments), being hit, a bite from a large dog

First aid during a cat seizure, what you SHOULD do

A panic reaction is natural, but the following steps can prevent injury to the cat and help you gather the information the vet needs:

• Stay calm, you cannot stop a seizure that is in progress. Your job is to protect the cat from injury, not to stop the seizure.
• Protect it from physical injury, a cat having a seizure in a high place (sofa, cupboard, table) is at risk of falling. Carefully slide it to the floor using a towel or thick blanket, hold it from underneath, not from above (the bite/scratch reflex is uncontrolled during a seizure). Keep it away from stairs, pools, aquariums.
• Note the time the seizure starts, look at the clock on your phone when the seizure begins. Activate a stopwatch if you can.
• Record a video if possible, ask someone else in the house to record, or place the phone in a position that captures the cat's whole body. This video is very valuable for the vet, especially to distinguish a true seizure from other conditions and to determine whether it is focal or generalized.
• Dim the stimuli, lower the TV/music volume, turn off overly bright lights, keep other cats/dogs out of the room. A calm environment helps the recovery phase.
• Note details to report to the vet, did the cat eat/drink something unusual in the last 24 hours? Was a flea product recently applied? Was there access to plants (lily, dieffenbachia)? Access to human medications or pesticides? Has it had a seizure before? Is it on any medication? If senior, is there a history of CKD or hypertension?
• After the seizure stops, let the cat recover on its own in a quiet, dark place. Speak softly, do not force it to stand or eat. Do not hold/pet it right away, many cats hiss or attack during the post-ictal phase due to disorientation. Wait until the cat is fully conscious before offering water.

What you must NOT do during a cat seizure

• DO NOT put your hand or any object into the mouth, a cat will not swallow its tongue during a seizure (that is a myth). Your hand will be bitten with uncontrolled force, serious injury because cat teeth are sharp and deep, plus infection risk (cat mouth bacteria). Rabies risk is also relevant if the cat is not fully vaccinated.
• DO NOT try to hold down the cat's body or legs, you will not be able to stop the seizure, and restraint can actually cause muscle injury, fractures, or joint dislocation (cat bones are relatively fragile). Just protect it from dangerous objects nearby.
• DO NOT douse it with cold water, it does not stop the seizure, and cats are very sensitive to hypothermia. Plus the risk of water aspiration into the lungs.
• DO NOT give food, water, or medication by mouth during the seizure and for several minutes afterwards, high risk of choking and aspiration because the swallowing reflex is not yet normal.
• DO NOT immediately hold/pet it to comfort it during the ictal phase, a seizing cat is unconscious and will not be comforted by petting; touch can instead trigger a scratching reflex.
• DO NOT try to give human seizure medication (diazepam, human phenobarbital) without a vet's instruction, the dose and formulation are very different; cats do not metabolise drugs like humans/dogs, high fatal risk. Oral diazepam in cats also carries a serious risk of idiosyncratic hepatotoxicity.
• DO NOT try to "neutralise" poisoning with milk, coconut oil, or home remedies, it can make things worse (slowing detoxification or causing aspiration). For suspected poisoning, go straight to the clinic, do not delay to try home remedies.

When to go to a 24-hour clinic immediately

Several seizure-related conditions are a true emergency that must go to a 24-hour clinic immediately, not wait until morning or be scheduled as a house call. For these conditions, a house call service (including ours) is NOT enough, the cat needs a facility with IV access, monitors, emergency injectable medications, and stabilisation capacity only available at a clinic with inpatient care.

Take it to a 24-hour clinic immediately if:

• The seizure lasts more than 5 minutes continuously, this is called status epilepticus, a condition that can be fatal because of brain overheating and permanent neuron damage. The vet needs to give IV anti-seizure medication (diazepam, midazolam, or injectable levetiracetam) to stop the abnormal electrical activity.
• Recurrent seizures within 24 hours (cluster seizures), more than one seizure episode in a day, even if the cat appears normal between episodes. High risk of status epilepticus.
• First-time seizure in a senior cat (>7 years, especially >10 years), a newly appearing first-time seizure in a senior cat is very often a sign of serious disease: meningioma, hypertensive encephalopathy from CKD, or hepatic encephalopathy. It needs immediate diagnostics, do not delay.
• Seizure after suspected poisoning, the cat just had a dog flea product applied (permethrin!), bit a lily, was exposed to antifreeze, or swallowed human medication. Decontamination treatment (inducing vomiting, activated charcoal, IV fluid, intralipid if needed) must begin as quickly as possible, the therapeutic window is short.
• Seizure after head trauma, especially a fall from height (high-rise syndrome) or being hit. Risk of brain hemorrhage or cerebral edema.
• Seizure accompanied by other serious symptoms, sudden blindness, one-sided paralysis, bluish gums (methemoglobinemia, often in paracetamol poisoning), very high or very low body temperature.
• The cat does not regain consciousness after the seizure stops, a very long post-ictal phase (>1 hour of coma) or the cat remains unresponsive.
• A kitten that has a seizure, metabolic conditions (hypoglycemia, hepatic encephalopathy from a congenital shunt) are fatal faster in kittens.

When you call the 24-hour clinic, mention: the cat's age, estimated body weight, seizure duration, number of seizures in the last 24 hours, and whether there is a history of flea product application / swallowing something suspicious. While on the way, one person drives and one holds the cat in a carrier lined with a thick towel, the carrier protects it if the cat seizes again during the trip.

What the vet will do at the clinic

After the cat is stable (the seizure stopped first if still active), the vet usually will:

• Complete physical and neurological examination, check reflexes, coordination, eye position, pupillary light reflex, cranial nerve function. Helps localise the problem in the brain.
• Fundic eye examination, especially in seniors, a detached / hemorrhagic retina confirms hypertension as the cause
• Blood pressure measurement, mandatory in all senior cats with a first-time seizure; detects CKD-secondary hypertension
• Comprehensive blood panel, CBC + biochemistry including glucose, BUN, creatinine, SDMA (more sensitive for early CKD in cats), electrolytes (Na, K, Ca, phosphorus), liver enzymes (ALT, ALP, GGT), ammonia (if hepatic encephalopathy is suspected), pre/post-prandial bile acids. T4 (hyperthyroidism in seniors can trigger hypertension that triggers seizures).
• Urinalysis, if dehydrated, if kidney issues are suspected
• Toxicology testing if certain poisoning is suspected
• FIP testing (especially young cats with seizures and fever), cerebrospinal fluid analysis if a referral facility is accessible
• Advanced imaging, if the basic examination is normal and the seizures are recurrent/cluster, the vet usually refers to a facility with MRI (to visualise brain structure, detect meningioma) + cerebrospinal fluid analysis to exclude infection or inflammation. Veterinary MRI in Indonesia is still limited to a few referral facilities.

Based on the results, the vet will classify the cause and design treatment:

• Metabolic/toxin cause identified → specific cause treatment (IV dextrose for hypoglycemia, lactulose for hepatic encephalopathy, decontamination + intralipid for permethrin poisoning, fomepizole/ethanol for ethylene glycol, the antihypertensive amlodipine for CKD hypertensive encephalopathy)
• Meningioma diagnosed → options: surgery (at a referral facility with a neurosurgeon), radiotherapy, or palliative care with steroids + antiepileptics
• Idiopathic epilepsy (an exclusion after all of the above is negative) → start lifelong antiepileptic medication

Long-term management for cat epilepsy

If the final diagnosis is idiopathic epilepsy or a structural cause managed medically, the cat needs regular antiepileptic medication. First-line choices in cats:

• Phenobarbital, the first gold standard for cats, effective. Given twice daily orally. Requires periodic blood level and liver enzyme monitoring. Early side effects: sleepiness, excessive hunger, excessive thirst, polyuria (usually resolves within 1-2 weeks). In cats the risk of idiosyncratic hepatotoxicity is rarer than in dogs, but monitoring remains important.
• Levetiracetam (Keppra), a modern alternative widely used in cats because it is safer for the liver, requires no blood level monitoring, and is well-tolerated. More expensive, and usually given three times daily (except extended-release). Often the modern first-line choice in cats.
• Zonisamide, another modern option, with a good side-effect profile in cats but more expensive.

An important note about medications that are NOT allowed for cats:

• Bromide (potassium bromide), very often triggers severe asthmatic bronchitis in cats (a relative contraindication). Used in dogs but avoid in cats.
• Oral diazepam, a risk of acute idiosyncratic hepatotoxicity that is often fatal in cats. IV/rectal diazepam is still used for emergency status epilepticus at the clinic, but the oral route for maintenance is avoided.

For an emergency at the clinic (status epilepticus), injectable medications such as IV/rectal diazepam or IM midazolam are used to break the acute seizure before maintenance therapy begins.

What is important for owners to understand:

• Not fully curable, the goal of therapy: reduce seizure frequency + duration, not eliminate them entirely
• Medication consistency is crucial, a single missed dose can trigger a seizure. Set a phone alarm. In cats, giving oral medication can sometimes be difficult, discuss with your vet the option of compounded liquid or transdermal if you struggle.
• Keep a seizure diary, record every event (date, duration, phase, trigger if any). Helps the vet adjust the dose.
• Regular monitoring, at least every 6 months a blood panel + blood pressure to monitor drug levels and liver/kidney function
• Do not stop medication abruptly, sudden phenobarbital withdrawal can trigger status epilepticus.

FAQ on cat seizures

My cat had a single seizure after I applied a flea product, is there a connection?

If you just applied a dog flea product (containing permethrin) to your cat, that is serious acute poisoning. Immediately bathe the cat with a gentle shampoo (baby shampoo or liquid soap) to remove the residual product from the fur, then go straight to a 24-hour clinic. IV intralipid treatment can be life-saving. Do not wait for the seizure to stop, permethrin effects can last 24-72 hours without treatment.

My cat is a senior (12 years), with a first-time seizure, does it need to go to the vet right away?

Yes, straight to a 24-hour clinic or within the first 24 hours at the latest. In senior cats, a first-time seizure is very often a sign of hypertensive encephalopathy (secondary to CKD), meningioma, or hepatic encephalopathy. Blood pressure measurement + a blood panel are mandatory. Hypertension treatment (amlodipine) is simple and effective if diagnosed quickly.

Is a seizure painful for a cat?

During the seizure, the cat is unconscious, it feels no pain from the seizure itself. The post-ictal phase may be uncomfortable (confusion, fatigue), and if there is physical injury from a fall or impact, that is what causes pain. A seizure not being painful does not mean it is not dangerous, a long duration still damages the brain from overheating and oxygen deprivation.

May I give human seizure medication (diazepam, human phenobarbital) to a cat?

DO NOT without a vet's instruction. In cats, even some human medications that are also used by vets for cats remain very risky to give without a specific dose per body weight. Oral diazepam in cats carries a risk of severe idiosyncratic hepatotoxicity, it can be fatal. A single 500 mg paracetamol tablet can be fatal to a cat. Aspirin has a very long half-life in cats. Do not experiment, always consult a vet first.

What plants and household items should be kept away from cats to prevent seizures?

The main list that can trigger seizures directly or via organ poisoning: all types of lily (Lilium, Hemerocallis), car antifreeze/coolant (ethylene glycol), any dog flea product (permethrin/pyrethroids), paracetamol/acetaminophen, tea tree oil and concentrated essential oils, chocolate in very high doses, human eye drops containing tetrahydrozoline (Visine), sugar-free candy with xylitol, dieffenbachia, sago palm, oleander plants. For Jakarta apartments that often use essential oil diffusers, make sure there is adequate ventilation and do not diffuse in a closed room with a cat.

How much does a 24-hour emergency clinic plus cat seizure diagnostics cost?

It varies depending on the clinic and diagnostic needs. A 24-hour emergency consultation, a comprehensive blood panel, blood pressure, and initial stabilisation usually add up. If MRI or CSF analysis is needed, that is a referral to a specialist facility with significant cost. It is better to invest in diagnostics up front to get an accurate diagnosis than to try medications without knowing the cause. Consult a vet for an estimate based on your cat's condition.

Summary

A cat seizure is a symptom of many different conditions, from acute poisoning (permethrin, lily, antifreeze, paracetamol) that needs treatment in the first hours, to meningioma or hypertensive encephalopathy in seniors that needs comprehensive diagnostics. In cats, idiopathic epilepsy is rarer than in dogs, most recurrent seizures have a structural or metabolic cause that is traceable if a thorough examination is done.

Distinguish a true seizure (loss of consciousness + uncontrolled stereotyped movements) from syncope (cardiac fainting, often HCM in cats) and tremor (conscious, localised). The three seizure phases, pre-ictal, ictal, post-ictal, are all relevant to report to the vet. A video during the episode + a record of the duration are the most valuable evidence for an accurate diagnosis.

First aid: protect the cat from physical injury (especially from falling from a height), record the duration, take a video, DO NOT put your hand in its mouth, DO NOT hold down its body, DO NOT try human seizure medication. For emergency conditions, a seizure lasting more than 5 minutes (status epilepticus), cluster seizures within 24 hours, a first-time seizure in a senior, suspected poisoning (especially permethrin/lily/antifreeze/paracetamol), or head trauma, go straight to a 24-hour clinic, not a house call. A house call does not have the capacity for IV access, monitors, emergency injectable medications, or treatments like intralipid that are needed in critical minutes.

Want an initial consultation to assess whether your cat's condition is an emergency or can be scheduled as a routine examination? Contact us on WhatsApp, mention the cat's age, breed, body weight, the duration and number of seizures, and what the cat ate/drank or had applied in the last 24 hours. The Prabasa Vet team will help assess whether you need to refer to a 24-hour clinic immediately or can schedule a routine home evaluation.

Read also: Dog Seizures: Causes and First Aid, Signs of a Cat Emergency You Should Not Delay, Complete Pet Emergency Guide.

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Medical references used in this article

This article was prepared with reference to the following sources, verified per clinical statement:

• Berendt M, Farquhar RG, Mandigers PJJ, et al., International Veterinary Epilepsy Task Force consensus report on epilepsy definition, classification and terminology in companion animals, BMC Veterinary Research 2015 , seizure classification (reactive, structural, idiopathic), idiopathic epilepsy diagnostic criteria, pre-ictal/ictal/post-ictal phases (adaptable to feline)
• Plumb's Veterinary Drug Handbook 7e, monographs for phenobarbital (feline maintenance dose, blood level monitoring), levetiracetam (feline dose 20 mg/kg PO q8h), diazepam (idiosyncratic hepatotoxicity warning in cats, oral route), IM midazolam emergency, intralipid for lipid-soluble toxicosis (permethrin)
• BSAVA Manual of Canine and Feline Neurology 5e, differentiating seizure vs syncope vs tremor in cats, focal vs generalized seizure in cats, diagnostic workup (blood panel → BP → fundus → bile acids → MRI + CSF)
• ISFM (International Society of Feline Medicine) Consensus on Feline Hypertension 2017 , guideline on blood pressure measurement in senior cats, hypertensive encephalopathy as a seizure differential in CKD
• ISFM Guidelines on the Diagnosis and Management of Feline Chronic Kidney Disease, the link CKD → secondary hypertension → end-organ damage including the CNS
• ASPCA Animal Poison Control Center & Plumb's Toxicology section, permethrin toxicity in cats (mechanism + treatment), lily (Lilium spp and Hemerocallis spp) → feline AKI, ethylene glycol toxicity, paracetamol (methemoglobinemia + hepatotoxicity) in cats

This article is a general guide based on the IVETF, BSAVA, ISFM international guidelines and veterinary toxicology references. For an accurate diagnosis and a treatment plan tailored to your cat's specific condition, consulting a veterinarian for a direct evaluation is the right step. Acute or recurrent seizures are an indication for referral to a 24-hour clinic, not a house call.