Indication

Diphenhydramine for Anaphylaxis

1,335 under review69 sources59 named agencies31 statesas of 2026-09-20

Pediatric weight-based dosing has a median of 1 mg/kg across 60 published protocols, with the middle half between 1 and 1.

69sources

59named agencies

31states

167entries

58named here

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

Pediatric, weight-basedmg/kg

60sources

50named agencies

29states

76entries

0kept as written

min	p25	median	p75	max
0.5	1	1	1	1.5

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 29%
IV/IM 28%
IM 12%
IV 9%
PO 8%
IV/IO 7%
IV/IM/PO 5%
IO/IM 1%
IV/IO/IM/PO 1%

United States EMS Protocol Census, n=60 protocols from 50 named agencies / 29 states, updated Sep 2026

Adultmg

57sources

49named agencies

27states

78entries

1kept as written

min	p25	median	p75	max
25	25	50	50	50

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/IO/IM 27%
IV/IM 22%
IM 14%
PO 13%
IV 12%
IV/IO 6%
IV/IM/PO 4%
IO/IM 1%
IV/IO/IM/PO 1%

United States EMS Protocol Census, n=57 protocols from 49 named agencies / 27 states, updated Sep 2026

Adult, weight-basedmg/kg

12sources

10named agencies

9states

12entries

0kept as written

min	p25	median	p75	max
1	1	1	1	1

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 50%
IV/IM 42%
IV/IM/PO 8%

United States EMS Protocol Census, n=12 protocols from 10 named agencies / 9 states, updated Sep 2026

Pediatricmg

1sources

1named agencies

1states

1entries

0kept as written

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

Routes

IV/IO/IM 100%

United States EMS Protocol Census, n=1 protocols from 1 named agencies / 1 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.