A seizure lasting 5 minutes or longer is a medical emergency and requires a 911 call immediately. A first-ever seizure in someone with no history of epilepsy also warrants an ER visit, even if it stops on its own. Beyond those two clear-cut situations, several other circumstances make emergency care necessary, and knowing them ahead of time can be the difference between a safe recovery and a dangerous delay.
The 5-Minute Rule
Most seizures end on their own within 1 to 3 minutes. When a convulsive seizure continues beyond 5 minutes, or when seizures repeat without the person fully waking up in between, the situation is classified as status epilepticus. This is a true neurological emergency. The longer it goes on, the harder it becomes to stop, and research using brain models suggests that permanent neurological damage can begin after roughly 30 minutes of continuous seizure activity. Treatment needs to start at the 5-minute mark, not at 30, which is why timing matters so much for bystanders.
If you’re witnessing a seizure, start timing it from the moment you first notice rhythmic jerking or stiffening. You don’t need to be precise to the second. If it’s clearly been going on for several minutes and shows no sign of stopping, call 911.
First-Time Seizures Always Need Evaluation
If someone has never had a seizure before and then has one, they should go to the ER regardless of how quickly it resolved. A first seizure can be caused by a brain tumor, an infection, a stroke, a bleed, or a metabolic problem like dangerously low blood sugar. The ER visit isn’t just about the seizure itself. It’s about finding out what caused it. Doctors will typically run blood work and perform a CT scan of the brain to rule out structural problems. About half of first-seizure patients also get a brain MRI for a more detailed look, depending on what the initial scan shows. An EEG (a test that measures electrical activity in the brain) may be done as well, though at many hospitals access can be delayed by 4 hours or more.
Specific Situations That Require 911
Even for someone with a known seizure disorder, certain circumstances turn an otherwise manageable seizure into an emergency. Call 911 if any of the following apply:
- The seizure lasts 5 minutes or longer.
- A second seizure follows without full recovery in between.
- Seizures are happening more frequently than usual for that person.
- Breathing becomes difficult or the person appears to be choking.
- The seizure happens in water, including a bathtub, pool, or lake.
- An injury occurs during the seizure, especially a head injury or a fall from height.
- The person is pregnant. Seizures during pregnancy or shortly after delivery can signal eclampsia, a life-threatening condition linked to dangerously high blood pressure. Complications affect 5.6% to 14% of women with eclampsia and can include stroke, organ failure, premature birth, and death of the mother or baby.
- The person has diabetes and the seizure may be caused by severely low blood sugar. If they’re unconscious or unable to swallow, they need emergency treatment immediately.
- The person asks for medical help after the seizure ends.
When a Known Seizure Follows Its Usual Pattern
For people with diagnosed epilepsy who have a seizure action plan, not every seizure requires an ambulance. If the seizure looks like their typical episodes, ends within a few minutes, and the person gradually returns to their normal state afterward, emergency care usually isn’t needed. The Epilepsy Foundation emphasizes that most seizures are self-limiting and resolve without medical intervention.
Some people with epilepsy have prescription rescue medications, typically a nasal spray, that a caregiver can administer during a prolonged seizure or a cluster of seizures. The FDA has approved two nasal options: one based on midazolam (approved in 2019 for ages 12 and older) and one based on diazepam (approved in 2020 for ages 6 and older). In clinical studies, using a rescue nasal spray reduced the need for ER visits to just 3 to 6% of patients, compared to 13% for those without rescue medication. If your neurologist has prescribed one of these, the seizure action plan will spell out when to use it and when to still call 911.
Warning Signs During Recovery
The period after a seizure, called the postictal state, often involves confusion, drowsiness, and sometimes agitation. This is normal and typically resolves within a few hours, though it can occasionally stretch to 1 to 2 days. What isn’t normal is a recovery phase that looks different from the person’s usual pattern.
Go to the ER if the person doesn’t regain consciousness within a reasonable time frame, if they develop new weakness on one side of their body, or if their confusion seems far more severe than what you’ve seen after previous seizures. New one-sided weakness after a seizure is particularly important because it can look similar to a stroke, and doctors will need brain imaging to tell the difference. Prolonged confusion that doesn’t improve can also be a sign that subtle seizure activity is still happening in the brain, even though the visible convulsions have stopped.
What Happens at the ER
If you do go to the emergency room, knowing what to expect can reduce some of the stress. For a first-time seizure, the ER team will draw blood to check for metabolic causes like low blood sugar, low sodium, or signs of infection. A CT scan of the head is standard to look for bleeding, tumors, or other structural issues. You’ll be asked detailed questions about what the seizure looked like, how long it lasted, what the person was doing beforehand, and whether there were any warning signs. If you witnessed the seizure, your account is extremely valuable since the person who seized often has no memory of it.
For someone with known epilepsy arriving after a prolonged or unusual seizure, the evaluation focuses on what changed. Did they miss medication? Are they sick with an infection? Is there a new trigger? The doctors may adjust medications or order additional imaging depending on what they find. Most seizure-related ER visits don’t result in hospital admission, but a first seizure or status epilepticus often does require at least an observation period.