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Open Dose Calculator →Fosphenytoin
Fosphenytoin sodium
💊 Used for: Status epilepticus, tonic-clonic seizures, partial seizures
Formulation
Tablet
Standard tablet
Dose Range
4–6 mg/kg
Max Daily
N/A
Frequency
q 6-8 hr IV/IM; loading 15-20 mg/kg IV
Max Single
150 mg
Route: IV/IM
Dose by Child Weight
Based on formulation: Standard tablet
| Child's Weight | Dose (mg) | Dose (ml) | Max Daily Dose (mg) |
|---|---|---|---|
| 5 kg | 20–30 mg | 20.0–30.0 ml | — |
| 6 kg | 24–36 mg | 24.0–36.0 ml | — |
| 7 kg | 28–42 mg | 28.0–42.0 ml | — |
| 8 kg | 32–48 mg | 32.0–48.0 ml | — |
| 9 kg | 36–54 mg | 36.0–54.0 ml | — |
| 10 kg | 40–60 mg | 40.0–60.0 ml | — |
| 12 kg | 48–72 mg | 48.0–72.0 ml | — |
| 15 kg | 60–90 mg | 60.0–90.0 ml | — |
| 18 kg | 72–108 mg | 72.0–108.0 ml | — |
| 20 kg | 80–120 mg | 80.0–120.0 ml | — |
| 25 kg | 100–150 mg | 100.0–150.0 ml | — |
| 30 kg | 120–180 mg | 120.0–180.0 ml | — |
* Always verify with your doctor. doses are approximate and may vary based on condition and formulation.
⚠️ Important Warnings
- •Water soluble prodrug of phenytoin. Max IV infusion 3 mg/kg/min.
💡 Use the DoseCare Calculator for interactive dose calculations tailored to your child's exact weight and formulation.
DoseCare is a decision support tool only. Always verify doses with a qualified healthcare provider.