Fosphenytoin for Seizure
Adult weight-based dosing has a median of 15 mg/kg across 7 published protocols, with the middle half between 12.5 and 17.5.
Doses far off from what other protocols give are likely misreads, so they are left out until checked. How that works.
Adult, weight-basedmg/kg
| min | p25 | median | p75 | max |
|---|---|---|---|---|
| 10 | 12.5 | 15 | 17.5 | 20 |
Values in mg/kg. One value per source (that source's median), so a document listing a medication five times still gets one vote.
Routes
- IV 71%
- IV/IM 14%
- IV/IO 14%
United States EMS Protocol Census, n=7 protocols from 1 named agencies / 5 states, updated Oct 2026
Pediatric, weight-basedmg/kg
| min | p25 | median | p75 | max |
|---|---|---|---|---|
| 15 | 15 | 20 | 20 | 20 |
Values in mg/kg. One value per source (that source's median), so a document listing a medication five times still gets one vote.
Routes
- IV 80%
- IV/IO 20%
United States EMS Protocol Census, n=5 protocols from 0 named agencies / 4 states, updated Oct 2026
Named agencies with a page1
Agencies whose protocols are a public record are named here. Their own doses are on their own pages; this list carries no values.