A seizure that lasts more than 5 minutes, or a second seizure that begins before the cat is fully conscious again, is status epilepticus. That is where a home problem becomes a hospital problem: recognize it in 3 minutes, drive for 15 minutes, and put nothing in the cat's mouth.
The 5-minute rule and the 2-seizure rule
A single generalized seizure usually runs 30 to 90 seconds, and most stop within 2 minutes. Two patterns override that. First, one seizure that passes 5 minutes without stopping. Second, 2 or more seizures inside 24 hours with no normal consciousness in between, which is a cluster. Either one means the brain's seizure-control system has already failed and needs drugs a cat cannot get at home. Cluster patterns are broken down further in seizure cluster emergency.
Timing decides the treatment. A seizure stopped at 3 to 5 minutes usually responds to 1 dose of a benzodiazepine. One that has run 20 to 30 minutes often needs 2 drugs plus a constant rate infusion, and carries a far higher risk of brain swelling and muscle breakdown. Every 10 minutes of delay moves the cat from the first group to the second.
The first 3 minutes at home
Skip anything that requires wrestling the cat.
- Note the start time to the minute on your phone. That single number decides whether you drive at minute 5 or minute 20.
- Clear a 1 m radius: chairs, cables, hot cups, anything the cat can hit during 30 to 90 seconds of paddling.
- Lower the lights and cut noise; a quiet room makes it easier to hear breathing.
- Slide a folded towel under the head and keep the body on its side. If the cat is on a stair landing or a shelf above 1 m, move it down with a blanket under the whole body, not by the scruff.
- Film 10 to 20 seconds of video; duration, limb involvement, and head position are the 3 details a vet asks first.
Five things never to do
- No fingers, spoon, pen, or thermometer in the mouth during the seizure. A cat cannot swallow its tongue, and jaw muscles at full contraction can fracture a finger in under 1 second.
- No water, milk, honey, or oral medicine during the seizure or within 10 minutes after it. The swallow reflex is unreliable, and 1 aspirated milliliter is enough to start pneumonia.
- No ice packs on the head or back mid-seizure. Cold on the skin triggers shivering, and shivering raises core temperature again within 2 to 3 minutes.
- Do not pin the limbs or press on the chest. Rib fractures and shoulder dislocations happen this way, and pressure on the chest reduces the oxygen the brain is already short of.
- Do not wait at home for a second seizure if the first one passed 5 minutes, or if the cat is still unresponsive 10 minutes after the shaking stopped.
A rectal temperature above 40 °C
Five minutes of continuous muscle activity can push rectal temperature to 40 °C or higher, and that heat is generated by the cat, not by the room. Once the seizure stops, take a rectal reading with a digital thermometer: 30 to 60 seconds, lubricated tip, 1 to 2 cm insertion. If handling is unsafe, skip it and report the seizure duration instead.
Above 40 °C the risk of brain and muscle damage climbs; above 41 °C the temperature is an emergency by itself, independent of the seizure. Cool with lukewarm water at 20 to 25 °C on towels placed at the neck, armpits, and groin, with a fan on low from 30 cm away, and stop cooling at 39.5 °C. Ice water and alcohol rubs are counterproductive for the reasons in the list above.
Transport: 15 minutes, 1 driver, 1 watcher
Call the hospital before you put the cat in the car. Give 4 facts in this order: seizure duration, number of seizures in the last 24 hours, rectal temperature, and any possible toxin exposure in the last 72 hours. If lily, sago palm, permethrin, or human medication is a possibility, say so on the phone and check the toxicity tool while you drive; plant and insecticide poisonings are catalogued in toxic houseplants.
Carry the cat in a carrier lined with a towel, lying on its side, head level with or slightly below the body if it has vomited. Keep the cabin at 20 to 22 °C. With 2 adults, 1 drives and 1 counts breathing with a hand on the chest, normally 20 to 30 breaths per minute; under 15 or over 40 needs reporting on arrival. Do not stop for food, water, or a second opinion.
The first 30 minutes at the hospital
Expect a fixed sequence.
- IV access in the cephalic or medial saphenous vein, usually within 5 to 10 minutes of arrival.
- Blood glucose check. Under 60 mg/dL is corrected with dextrose before anything else, because low glucose both causes seizures and worsens them.
- First-line benzodiazepine, repeated once after 5 minutes if the seizure is still running.
- Second-line drug if 2 doses fail: levetiracetam or phenobarbital, sometimes as a 6 to 24 hour infusion.
- Blood work for ionized calcium, potassium, and liver and kidney values; ionized calcium under 1.0 mmol/L triggers seizures.
- Oxygen, plus active cooling if the temperature is still above 40 °C on arrival.
| Finding | Threshold | Comparison value | Action |
|---|---|---|---|
| Seizure length | 5 min | Common 30 to 90 s | Drive now |
| Seizures without recovery | 2 in 24 h | 1 in 24 h is single | Drive now |
| Rectal temperature | 40.0 °C | Normal 38.0 to 39.2 °C | Cool and drive |
| Unresponsive after seizure | 10 min | Most recover in 5 to 30 min | Drive now |
| Respiratory rate | 40 per min | Normal 20 to 30 per min | Oxygen at clinic |
| Blood glucose | 60 mg/dL | Normal 80 to 120 mg/dL | Dextrose IV |
The 24 to 72 hours after
Keep the cat in 1 quiet room with low furniture, water within 1 m of the bed, and a litter box on the same floor. Many cats seizure again within 24 to 72 hours, so this is not the week to introduce a new pet, move furniture, or skip a meal schedule. Post-ictal signs such as wobbling, head pressing, and temporary blindness fade over 5 to 30 minutes, occasionally 24 hours.
Write 3 things in a notebook for every event: start time, duration in seconds, and what happened in the 10 to 15 minutes before it, such as hiding, staring, salivation, or circling. Three logged events say more than a remembered description, and the pattern decides whether daily medication starts now or after a blood test at 4 to 6 weeks.
Five steps to run right now
- Start a timer at the first paddling movement and say the time out loud.
- Clear 1 m, dim the room, towel under the head.
- Keep hands, spoons, and water away from the mouth for the full seizure plus 10 minutes.
- At minute 5, or at the second seizure: call, load the carrier, drive.
- Take the rectal temperature when the shaking stops, cool toward 39.5 °C above 40 °C, and hand over your written times.
Frequently asked
How long can a cat seizure last before it is an emergency?
Five minutes. Any seizure still running at the 5-minute mark, or a second seizure before the cat is fully conscious again, needs a hospital. Aim for 15 minutes from the first paddling movement to the clinic door, with nothing placed in the mouth on the way.
Should I put a spoon or my finger in the cat's mouth?
No. A cat cannot swallow its tongue, and jaw muscles at full contraction can break a finger in under 1 second; a spoon can fracture teeth. Clear a 1 m area instead, slide a folded towel under the head, and write down the start time.
What temperature is dangerous during a seizure?
A rectal reading above 40 C after 5 minutes of muscle activity calls for 20 to 25 C wet towels at the neck, armpits, and groin. Above 41 C is an emergency by itself, and cooling stops at 39.5 C.