Atonic seizures

Atonic seizures can be generalised onset, meaning they affect both sides of the brain from the start.

Or they can be focal onset, meaning they start in just one side of the brain. Atonic seizures are sometimes called drop attacks.

What happens during an atonic seizure?

If you have atonic seizures, usually all your muscles go limp and you drop to the floor. This can result in injuries to your head or face. Sometimes you might not completely fall, but your head may drop forward or you might sag at the knees.

 

How long do atonic seizures last?

Atonic seizures are very short, usually lasting less than two seconds.

 

What happens after an atonic seizure?

Your muscle tone returns as soon as the seizure is over. If you’ve fallen, you can get up again straight away.

 

How can someone help me during an atonic seizure?

Our short online first aid course shows you what atonic seizures can look like, and how to help when someone has one. Visit atonic seizure first aid.

We're here to help

Got more questions?

Our expert advisors can help you with any questions you might have about atonic seizures or anything else related to living with epilepsy.

Contact the helpline
This information has been produced under the terms of the PIF TICK. The PIF TICK is the UK-wide Quality Mark for Health Information. Please contact website@epilepsy.org.uk if you would like a reference list for this information.
Published: June 2022
Last modified: December 2024
To be reviewed: August 2025
Tracking: A004.06 (previously B037)
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