Levetiracetam 500 mg
(often sold as Keppra® or in generic form)
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1. What is it?
Levetiracetam is an anticonvulsant (antiepileptic) drug. It’s used to treat seizures and epilepsy, and it’s also prescribed for certain types of partial‑onset seizures with or without secondary generalization, myoclonic seizures, and sometimes status epilepticus.
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2. Typical dosing (adult)
| Condition | Starting dose | Titration | Max dose |
|-----------|--------------|-----------|----------|
| Partial‑onset seizures | 250 mg twice daily (500 mg/day) | 250 mg every 3–5 days until 500 mg twice daily (1 g/day) | 4 g/day (split) |
| Myoclonic seizures | 500 mg twice daily (1 g/day) | Increase in 250‑500 mg steps | 4 g/day |
| Status epilepticus (IV) | 1 g IV over 15–30 min, then 0.5 g every 6 h | Continue 1–2 g/day | 4 g/day |
Your 500 mg tablet is usually part of a twice‑daily regimen. For many people, the maintenance dose is 1 g/day (500 mg BID), but your prescriber may adjust it.
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3. How it works
Levetiracetam binds to the synaptic vesicle protein SV2A, modulating neurotransmitter release and reducing neuronal excitability. Its exact mechanism in seizure control isn’t fully understood, but the SV2A interaction appears to dampen hyper‑excitable networks.
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4. Common side‑effects
| Category | Typical symptoms |
|----------|------------------|
| CNS | Irritability, drowsiness, dizziness, fatigue, mood changes (anxiety, depression) |
| GI | Nausea, vomiting, abdominal pain, loss of appetite |
| Others | Headache, rash, tremor, blurred vision |
- Psychiatric: About 1–4 % of patients report aggression, agitation, or suicidal ideation. Watch for mood changes.
- Kidney: Levetiracetam is excreted unchanged by the kidneys; dose adjustments are needed for renal impairment.
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5. Drug interactions
| Drug | Interaction | Why it matters |
|------|-------------|----------------|
| Valproic acid | None clinically significant (but watch for combined CNS effects) | Both can cause drowsiness |
| Carbamazepine, phenytoin, phenobarbital | Induce CYP450 enzymes → ↓ levetiracetam levels | May reduce seizure control |
| Metformin | No major interaction | Levetiracetam has no effect on glucose metabolism |
| Antidepressants (SSRIs, SNRIs) | Possible additive CNS depression | Monitor for excessive sedation or mood changes |
| Alcohol | CNS additive effects | Avoid heavy drinking |
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6. Important safety tips
1. Missed dose: Take as soon as remembered unless it’s almost time for the next dose. Do not double‑dose.
2. Kidney function: Have serum creatinine & eGFR checked periodically (every 3–6 months if on >1 g/day).
3. Pregnancy: Category C – use only if benefits outweigh risks; discuss contraception.
4. Driving & machinery: If you feel drowsy or have dizziness, avoid driving until you know how the drug affects you.
5. Side‑effects: Report any new or worsening psychiatric symptoms, severe rash, or unexplained bleeding.
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7. Storage & handling
- Keep in a cool, dry place; avoid excess moisture.
- Store out of reach of children and pets.
- Do not crush or chew tablets unless instructed—though some formulations are chewable for pediatric use.
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8. When to seek medical help
- Severe allergic reactions (rash, itching, swelling, trouble breathing).
- Persistent severe dizziness or fainting.
- Unexplained bleeding or bruising.
- Persistent suicidal thoughts or worsening depression.
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9. Quick FAQ
| Question | Answer |
|----------|--------|
| Can I stop taking it abruptly? | No. Sudden discontinuation can precipitate seizures. Taper gradually under supervision. |
| Does it cause weight gain? | No significant weight effect reported. |
| Is it safe during breastfeeding? | Excreted in breast milk. Discuss with your healthcare provider. |
| Can I take it with food? | Yes—food does not significantly affect absorption. |
| What’s the brand name? | Keppra® (by Pfizer) and various generics. |
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Bottom line
Levetiracetam 500 mg is a commonly prescribed, generally well‑tolerated antiepileptic that you’ll likely take twice daily. It’s important to keep track of kidney function, monitor for mood or CNS side‑effects, and follow your prescriber’s dosing schedule closely.
If you have any specific questions about how it fits into your treatment plan or concerns about side‑effects, let me know!