US EMS Protocol Census
Indication

Diphenhydramine for Other

1,335 under review55 sources47 named agencies27 statesas of 2026-09-20

Adult dosing has a median of 25 mg across 50 published protocols, with the middle half between 25 and 50.

55sources
47named agencies
27states
124entries
44named here

1,335 rows are under review across the census and excluded from every number on this page. How that works.

Adultmg

50sources
44named agencies
25states
72entries
1kept as written
minp25medianp75max
12.525255050

Values in mg. One value per source (that source's median), so a document listing a drug five times still gets one vote.

Routes

  • IV/IM 32%
  • IV/IO/IM 29%
  • IV 13%
  • PO 13%
  • IM 7%
  • IV/IO/IM/PO 3%
  • IO/IM 1%
  • IV/IM/PO 1%
  • IV/IO 1%

United States EMS Protocol Census, n=50 protocols from 44 named agencies / 25 states, updated Sep 2026

Pediatric, weight-basedmg/kg

31sources
25named agencies
18states
43entries
0kept as written
minp25medianp75max
0.51111.5

Values in mg/kg. One value per source (that source's median), so a document listing a drug five times still gets one vote.

Routes

  • IV/IO/IM 35%
  • IV/IM 30%
  • IV 9%
  • PO 7%
  • IM 5%
  • IV/IM/PO 5%
  • IV/IO/IM/PO 5%
  • IO/IM 2%
  • IV/IO 2%

United States EMS Protocol Census, n=31 protocols from 25 named agencies / 18 states, updated Sep 2026

Adult, weight-basedmg/kg

4sources
2named agencies
3states
5entries
0kept as written

Below 5 sources, so no distribution is published for this group — only the counts above.

Routes

  • IV/IO/IM 40%
  • IV 20%
  • IV/IM/PO 20%
  • IV/IO/IM/PO 20%

United States EMS Protocol Census, n=4 protocols from 2 named agencies / 3 states, updated Sep 2026

Pediatricmg

4sources
4named agencies
3states
4entries
0kept as written

Below 5 sources, so no distribution is published for this group — only the counts above.

Routes

  • PO 75%
  • IV/IM 25%

United States EMS Protocol Census, n=4 protocols from 4 named agencies / 3 states, updated Sep 2026

Named agencies

Agencies whose protocols are a public record are named here. Their own doses are on their own pages; this list carries no values.