Indication

Diphenhydramine for Dystonic reaction

134 sources114 named agencies40 statesas of 2026-10-31

Adult dosing has a median of 37.5 mg across 123 published protocols, with the middle half between 25 and 50.

134sources

114named agencies

40states

259entries

110named here

Doses far off from what other protocols give are likely misreads, so they are left out until checked. How that works.

Adultmg

123sources

106named agencies

40states

136entries

0kept as written

min	p25	median	p75	max
12.5	25	37.5	50	50

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

Routes

IV/IO/IM 35%
IV/IM 35%
IV 10%
IV/IO/IM/PO 7%
IM 4%
IV/IM/PO 4%
IV/IO 4%
PO 2%

United States EMS Protocol Census, n=123 protocols from 106 named agencies / 40 states, updated Oct 2026

Pediatric, weight-basedmg/kg

104sources

88named agencies

36states

112entries

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 medication five times still gets one vote.

Routes

IV/IO/IM 38%
IV/IM 35%
IV/IO/IM/PO 10%
IV 9%
IV/IM/PO 4%
IM 3%
IV/IO 1%
PO 1%

United States EMS Protocol Census, n=104 protocols from 88 named agencies / 36 states, updated Oct 2026

Adult, weight-basedmg/kg

9sources

8named agencies

8states

10entries

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 medication five times still gets one vote.

Routes

IV/IM 50%
IV/IO/IM 20%
IV/IO/IM/PO 20%
IV/IO 10%

United States EMS Protocol Census, n=9 protocols from 8 named agencies / 8 states, updated Oct 2026

Pediatricmg

1sources

0named agencies

1states

1entries

0kept as written

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

Routes

IV 100%

United States EMS Protocol Census, n=1 protocols from 0 named agencies / 1 states, updated Oct 2026

Named agencies with a page110

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