Time the seizure, and keep watching for 30 minutes after it stops, because that half hour tells you whether the cat is recovering or sliding into a second event. A single fit under 5 minutes, in a cat that is walking, seeing and drinking 30 minutes later, can wait for a morning appointment. Anything else goes tonight. While the fit is happening, three things are off the table: do not put a hand or a spoon in the mouth, do not pin the limbs down, and do not pour water or medicine in.
Three numbers frame the decision. Five minutes of continuous seizure activity is status epilepticus. Two or more fits inside 24 hours is a cluster. And a cat that is still not itself 30 minutes after the fit has a post-ictal phase that is too long.
The 30 minutes after it stops
Clear the floor, dim the lights and cut the noise; a cat in the post-ictal phase is confused, often temporarily blind, and startles at a hand. Keep your distance of about 1 meter and let it walk if it can. Note the start and stop times, which limbs moved, whether the head turned to one side, and whether it lost bladder or bowel control: those 5 details separate a brain lesion from a metabolic cause.
Check the mouth and paws for burns, cuts or broken claws, and take a rectal temperature if you can do it safely: above 39.5 C after 10 minutes of fitting means cooling with a fan and a damp cloth, not ice water. Do not offer food or water until the cat is standing steadily, usually 15 to 30 minutes.
Three red lines that skip the waiting room
- Any fit still running at 5 minutes, or 2 fits within 24 hours, including one that was only 60 seconds.
- No return to normal awareness 30 minutes after the fit, or a second fit before it recovered from the first.
- Breathing that stays above 40 a minute, gums that are blue or gray, or a temperature above 40 C.
Add a fourth for cats with a known condition: a diabetic cat that fits may be at 40 mg/dL of glucose, and a cat with kidney disease may be at a potassium of 7 mmol/L or more. Both are treated as emergencies, not as epilepsy.
The 48-hour log: 6 fields, 2 pages
Write 6 fields for every event in the next 48 hours: date and clock time, duration in seconds, what the cat was doing beforehand, which body parts moved, how long the confusion lasted, and what it did afterwards, from sleeping to raiding the bowl. A 20-second phone video beats a paragraph of description, so film first and describe second.
Also record the 24 hours before the first fit: any new food, a flea treatment, a missed dose, a fall, or a bin raid. A spot-on product, a lily, or a permethrin dog spray is a common cause; check the label in a toxic lookup before the appointment. Cluster events are covered in seizure clusters.
Two tests that decide the plan
Blood first. A minimum database is glucose, ionized calcium, sodium, potassium, chloride, BUN, creatinine, liver enzymes, bile acids, and a packed cell volume. It answers the cheap questions: low glucose below 60 mg/dL, calcium outside 1.1 to 1.3 mmol/L, a sodium under 140 mmol/L, or a potassium over 5.5 mmol/L each change the treatment on its own.
Imaging second. An MRI is the only way to see a structural lesion, and it is booked when the cat is over 5 years old, when the exam between fits is abnormal, when the fits are one-sided, or when behavior changed with the first fit. A CT is a cheaper substitute for bleeding and tumors but not for inflammation. Chest X-rays and an ultrasound come first if the bloodwork points at the liver, kidneys or heart.
| Test | Normal range | Timing | What an abnormal result means |
|---|---|---|---|
| Blood glucose | 60-120 mg/dL | Within 1 hour | Below 60 is a cause, not a consequence |
| Ionised calcium | 1.1-1.3 mmol/L | Within 1 hour | Low calcium drives tremors and fits |
| Potassium | 3.5-5.5 mmol/L | Within 1 hour | Over 7 threatens the heart rhythm |
| Bile acids | Under 15 umol/L | Within 24 hours | High means a liver shunt is possible |
| MRI brain | 0 lesions | Within 7 days | A mass, scar or swelling changes the plan |
Hour 0 to hour 24
Minute 0: start timing, clear the floor, film 20 seconds. Minute 5: still fitting means call the clinic and drive. Minute 30: the cat should be aware, even if wobbly; note what it does. Hour 1: still wobbly is normal; check breathing, gums and temperature. Hour 2: most cats are steady again; offer a teaspoon of water, then a small meal. Hour 6: watch for a second fit and for pacing, head pressing or circling. Hour 24: a second fit in this window makes it a cluster, which needs medication started today rather than next week.
The post-ictal cat: blind, hungry, or aggressive
For 24 to 72 hours after a fit, a cat may walk into walls, drink excessively, yowl, or refuse to be touched. Vision usually returns within 24 hours and full behavior within 3 days. Keep it in one quiet room with a litter box 1 meter from the bed and no stairs to fall down.
Do not let it out: a post-ictal cat outside is disoriented, does not come when called, and the 48 hours after a first fit carry the highest risk of a second.
Medication: names, not doses
Vets reach for phenobarbital, levetiracetam, zonisamide or potassium bromide, alone or in pairs, all by prescription; none of the numbers here is a dose. Phenobarbital needs blood levels and liver values checked at 2 weeks, then every 3 to 6 months. Never stop a seizure medicine abruptly, because withdrawal can trigger a cluster that is harder to break than the original problem.
Heat, water and the things that hurt
Do not put the cat in a cold bath, do not force ice into the mouth, and do not wrap it tightly in a blanket during the fit, because you cannot see the breathing. After the fit, a fan and a damp cloth on the belly drop the temperature about 1 C in 10 minutes. Keep the room at 20 to 24 C and the floor clear of hard edges.
Five rules for the next 48 hours
- Log every event with 6 fields and keep a 20-second video.
- Feed at the same times; a cat on phenobarbital gets hungrier and will ask for 2 extra meals.
- No new food, no new spot-on, no essential oils, no lily in the house.
- Book the bloodwork for today and the review for 48 hours.
- If a fit passes 5 minutes or a second one starts, go in; do not wait for the 30-minute rule.
Terms mentioned in this article
Frequently asked
How long after a seizure should a cat be normal again?
Most cats are walking and aware within 30 minutes and fully themselves within 24 to 72 hours. Blindness, pacing, yowling and excessive drinking are common in that window and usually settle. A cat that is still not aware 30 minutes after the fit, or that has a second fit before recovering, needs to be seen the same night.
What counts as an emergency after a cat seizure?
A fit lasting 5 minutes, 2 fits within 24 hours, no return to normal awareness 30 minutes after the fit, breathing above 40 a minute, blue gums, or a temperature above 40 C. Each of those skips the appointment queue. A diabetic or kidney cat that fits is also an emergency, because glucose and potassium can be the cause.
What should I write in a seizure diary?
Six fields per event: date and exact time, duration in seconds, what the cat was doing beforehand, which body parts moved, how long the confusion lasted, and what it did afterwards. Add a 20-second phone video. Together those details tell a neurologist more than a page of description, and they decide whether an MRI is booked.
Related guides
- Cat Seizure Past 5 Minutes: Status Epilepticus Steps
- Seizure Clusters in Cats: 5-Minute Rule and Diazepam
- Cat Seizures: The 3 Phases, a 3-Minute Rule, and What to Do First
- Frostbite in Cats: Rewarm at 37-40 C, Never Rub
- Anaphylaxis in Cats: The 5-Minute Window
- Cat Drank Antifreeze: 2 mL, 30-Minute Window