Strength500 mg
Formoral.solid
Adult dose and durationAdults 16 years and over: 250-500 mg twice daily, increased by 250-500 mg twice daily at 2-week intervals to a usual 1000-1500 mg twice daily - Long-term; when stopping, withdraw gradually using the same step sizes as at initiation
Paediatric dose10-30 mg/kg/dose [child max 1500 mg]
(The 10-30 mg/kg/dose above is the 4-to-under-16 band. Younger children start lower - read the band you need. 4 to under 16 years: 10 mg/kg twice daily, increased by 10 mg/kg twice daily every 2 weeks to 30 mg/kg twice daily. 6 months to under 4 years: 10 mg/kg twice daily up to 25 mg/kg twice daily. 1 to under 6 months: 7 mg/kg twice daily up to 21 mg/kg twice daily. Syrup 100 mg/mL. Reduce in renal impairment per the formulary table.)
Dose by age| 1 to under 6 months: | 7 mg/kg twice daily, up to 21 mg/kg twice daily |
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| 6 months to under 4 years: | 10 mg/kg twice daily, up to 25 mg/kg twice daily |
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| 4 to under 16 years: | 10 mg/kg twice daily, increased every 2 weeks to 30 mg/kg twice daily |
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Dose by weight| 3kg | 30-90 mg/dose |
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| 4kg | 40-120 mg/dose |
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| 5kg | 50-150 mg/dose |
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| 6kg | 60-180 mg/dose |
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| 7kg | 70-210 mg/dose |
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| 8kg | 80-240 mg/dose |
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| 9kg | 90-270 mg/dose |
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| 10kg | 100-300 mg/dose |
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| 11kg | 110-330 mg/dose |
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| 12kg | 120-360 mg/dose |
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| 13kg | 130-390 mg/dose |
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| 14kg | 140-420 mg/dose |
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| 15kg | 150-450 mg/dose |
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| 16kg | 160-480 mg/dose |
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| 17kg | 170-510 mg/dose |
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| 18kg | 180-540 mg/dose |
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| 19kg | 190-570 mg/dose |
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| 20kg | 200-600 mg/dose |
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| 21kg | 210-630 mg/dose |
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| 22kg | 220-660 mg/dose |
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| 23kg | 230-690 mg/dose |
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| 24kg | 240-720 mg/dose |
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| 25kg | 250-750 mg/dose |
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| 26kg | 260-780 mg/dose |
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| 27kg | 270-810 mg/dose |
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| 28kg | 280-840 mg/dose |
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| 29kg | 290-870 mg/dose |
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| 30kg | 300-900 mg/dose |
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| 31kg | 310-930 mg/dose |
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| 32kg | 320-960 mg/dose |
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| 33kg | 330-990 mg/dose |
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| 34kg | 340-1020 mg/dose |
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| 35kg | 350-1050 mg/dose |
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| 36kg | 360-1080 mg/dose |
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| 37kg | 370-1110 mg/dose |
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| 38kg | 380-1140 mg/dose |
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| 39kg | 390-1170 mg/dose |
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| 40kg | 400-1200 mg/dose |
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| 41kg | 410-1230 mg/dose |
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| 42kg | 420-1260 mg/dose |
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| 43kg | 430-1290 mg/dose |
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| 44kg | 440-1320 mg/dose |
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| 45kg | 450-1350 mg/dose |
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| 46kg | 460-1380 mg/dose |
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| 47kg | 470-1410 mg/dose |
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| 48kg | 480-1440 mg/dose |
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| 49kg | 490-1470 mg/dose |
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| 50kg | 500-1500 mg/dose |
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ChoiceAlternatives. Levetiracetam needs no cardiac monitoring and has far fewer interactions than phenytoin; the ESETT trial found no difference in seizure termination.
Dose sourceEgyptian National Drug Formulary - Nervous System 2025 (levetiracetam monograph)
Why67 live products - the largest genuinely therapeutic orphan after esomeprazole. This is the drug the patient is continued on after the acute seizure has been stopped, and there is no chronic epilepsy condition in the dataset for it to attach to.
Cautions- The emergency drugs in this condition are the benzodiazepines; levetiracetam is the agent given afterwards to prevent recurrence.
- The intravenous LOADING dose used for established status epilepticus is deliberately not stated here. NICE NG217 7.1.9 names levetiracetam as a second-line IV option in convulsive status epilepticus not responding to 2 doses of a benzodiazepine, but states no mg figure in that recommendation; NG217 also records that in April 2022 this was an off-label use of levetiracetam. Look up a dose before giving intravenous levetiracetam.
- Behavioural and mood effects are common and dose-related: irritability, aggression, agitation, depression and, rarely, suicidal ideation. Ask the family, not just the patient.
- Reduce the dose in renal impairment - 500-1000 mg twice daily at CrCl 50-79, 250-750 mg twice daily at 30-49, 250-500 mg twice daily below 30, and 500-1000 mg once daily on dialysis with a 250-500 mg supplement after each session.
- Do not stop abruptly - withdrawal seizures.
- The intravenous route is only for when oral administration is temporarily not feasible.