What is the recommended intravenous loading and maintenance dose of levetiracetam (Keppra)?

Keppra IV Dosing

For adults, initiate levetiracetam IV at 500 mg twice daily (1000 mg/day total), with the option to load with higher doses up to 60 mg/kg (maximum 4500 mg) in acute seizure situations, particularly status epilepticus. 1

Standard Maintenance Dosing

Adults (≥16 years)

• Initial dose: 500 mg IV twice daily (1000 mg/day total) 1
• Dose escalation: Increase by 500 mg twice daily every 2 weeks as needed 1
• Maximum recommended dose: 1500 mg twice daily (3000 mg/day total) 1
• Note: Doses exceeding 3000 mg/day show no additional benefit 1

Pediatric Dosing (Partial-Onset Seizures)

1 month to <6 months:

• Initial: 7 mg/kg IV twice daily
• Titrate by 7 mg/kg twice daily every 2 weeks
• Target: 21 mg/kg twice daily 1

6 months to <4 years:

• Initial: 10 mg/kg IV twice daily
• Titrate by 10 mg/kg twice daily every 2 weeks
• Target: 25 mg/kg twice daily 1

4 years to <16 years:

• Initial: 10 mg/kg IV twice daily
• Titrate by 10 mg/kg twice daily every 2 weeks
• Target: 30 mg/kg twice daily (maximum 3000 mg/day) 1

Loading Doses for Status Epilepticus

Benzodiazepine-Refractory Status Epilepticus

For adults and adolescents with ongoing seizures despite adequate benzodiazepine dosing, administer levetiracetam 60 mg/kg IV (maximum 4500 mg) as a loading dose. 2

• This achieves seizure cessation in approximately 47% of patients 2
• Efficacy is equivalent to fosphenytoin and valproate 2
• Can be administered as rapid IV push (undiluted or minimally diluted) 3, 4

Pediatric Status Epilepticus Loading

For children with convulsive or non-convulsive status epilepticus:

• Loading dose: 40 mg/kg IV bolus (maximum 2500 mg) 2
• Administer in addition to maintenance dosing 2

Maintenance after status epilepticus resolution:

• Non-convulsive: 15 mg/kg IV every 12 hours (maximum 1500 mg) 2
• Convulsive: 30 mg/kg IV every 12 hours OR increase prophylaxis dose by 10 mg/kg (to 20 mg/kg) every 12 hours (maximum 1500 mg) 2

Administration Considerations

Preparation and Infusion

• Standard dilution: Dilute in 100 mL compatible diluent 1
• Rapid administration: Can be given undiluted or minimally diluted as IV push 3, 4
• High-dose safety: Doses up to 4500 mg administered as rapid IV push are well-tolerated (99.4% tolerability) 4
• Duration of IV therapy: No clinical experience beyond 4 days of continuous IV administration 1

Safety Profile

Levetiracetam demonstrates superior safety compared to traditional agents:

• Significantly fewer adverse events than phenobarbital 2
• Lower risk of hypotension (0.7% vs 3.2% with fosphenytoin) 2
• Lower risk of respiratory depression 2
• Minimal cardiopulmonary effects 3, 4
• Most common adverse effects: injection site pain, agitation 3

Important Caveats

• Renal adjustment required: Dose modifications needed for creatinine clearance <80 mL/min 1
• Hemodynamic monitoring: While generally well-tolerated, monitor blood pressure when administering high doses (≥3000 mg), particularly in patients on concurrent vasoactive medications 5
• Switching to oral: When transitioning from IV to oral, maintain equivalent total daily dose and frequency 1
• Seizure prophylaxis: For CAR T-cell therapy patients with CNS disease or seizure history, use 10 mg/kg (maximum 500 mg) every 12 hours for 30 days 2