Levetiracetam: what it does and what to watch

Also known as: Antiepileptic medicine · Anticonvulsant (antiepileptic) medicine · Updated 2026-08-19 · Educational — not medical advice

Illustrative — the brain, where a seizure's electrical activity begins

In plain language: The exact way this medicine prevents seizures isn't fully mapped out, but it's understood to bind to a specific protein on the surface of nerve cell compartments that store and release chemical messengers. By attaching to this protein, it appears to dampen the runaway, synchronized electrical activity among nerve cells that produces a seizure, without broadly suppressing normal nerve signaling elsewhere in the way some older seizure medicines do.

What it's used for

  • Management of certain types of seizures
  • Add-on or standalone treatment for epilepsy
  • Seizure control following some types of brain injury in specific situations

Common side effects

  • Drowsiness or tiredness
  • Dizziness
  • Irritability or mood changes
  • Weakness
  • Headache
  • Loss of coordination

Get medical help if…

Marked behavior or mood changes, including new depression, agitation, or thoughts of self-harm, which should be discussed with a prescriber promptly

Severe skin reactions with rash, blistering, or peeling

Signs of a severe allergic reaction such as facial swelling or difficulty breathing

Unusual weakness, confusion, or worsening seizures rather than improvement

Lab values it can move

Few guides tell you this part: medicines show up in blood work. If you take Levetiracetam and a value below looks off on your report, this may be part of the story — never stop a medicine without your doctor.

This medicine has a comparatively quiet effect on routine blood tests; a mild reduction in some blood cell counts has been reported only occasionally and does not require the intensive laboratory monitoring associated with several older seizure medicines.

WBC / Total Leukocyte Count

Good to know

  • Do not stop this medicine abruptly, since sudden discontinuation can trigger seizures, even if it was started for a short-term reason
  • Mood or behavior changes, including new irritability or low mood, should be raised with a prescriber rather than dismissed
  • Drowsiness can affect activities that need alertness until individual response is known
  • Tell a prescriber about any history of depression or mental health conditions before starting
  • Missed doses and any changes to the seizure treatment plan should go through a prescriber rather than being self-adjusted

Questions people ask

Why is this medicine considered easier to monitor than some older seizure medicines?

It has fewer interactions with other drugs and doesn't require the routine blood-level or organ-function monitoring that some older anticonvulsants need, since it's processed mostly by the kidneys rather than heavily by the liver. This makes it more straightforward to combine with other treatments, though periodic clinical follow-up still matters for overall care.

Why do mood changes get specifically asked about?

This medicine has been associated with irritability, agitation, or low mood in some people, occasionally more noticeably than with other seizure medicines. These changes can develop gradually and might not feel obviously connected to a medicine that's treating seizures, which is why prescribers ask about mood directly rather than waiting for it to be mentioned.

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