Indication

Ondansetron for Nausea / vomiting

213 sources178 named agencies49 statesas of 2026-10-31

Adult dosing has a median of 4 mg across 208 published protocols, with the middle half between 4 and 4.

213sources

178named agencies

49states

676entries

173named here

Includes 3 agencies outside the US.

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

Adultmg

208sources

173named agencies

48states

348entries

0kept as written

min	p25	median	p75	max
4	4	4	4	8

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/IM 14%
IV 13%
PO 10%
ODT 9%
IV/IO/IM 7%
IV/IM/PO 5%
IV/IO/IM/PO 5%
IV/IM/ODT 4%
IV/IO/IM/PO/ODT 4%
IV/IO 4%
IM 3%
IV/IO/IM/ODT 2%
IV/IO/ODT 2%
PO/ODT 2%
IV/IM/PO/ODT 1%
IV/PO 1%
SL 1%
IV/IO/PO 1%
IV/ODT 1%
PO/SL 1%
SL/ODT 1%
IV/IM/PO/SL 1%
IV/IO/IM/IN/PO 1%
IV/IO/SL 1%
IV/SL 1%
IV/IM/IN 1%
IV/IO/IM/SL 1%
IM/ODT 0%
IM/PO/ODT 0%
IO 0%
IV/IM/PO/SL/ODT 0%
IV/IM/SL 0%
IV/IO/IM/IN 0%
IV/IO/IM/IN/ODT 0%
IV/IO/IM/PO/SL 0%
IV/IO/PO/SL 0%
IV/IO/SQ/SL 0%

United States EMS Protocol Census, n=208 protocols from 173 named agencies / 48 states, updated Oct 2026

Pediatric, weight-basedmg/kg

154sources

126named agencies

43states

203entries

0kept as written

min	p25	median	p75	max
0.05	0.1	0.1	0.15	0.2

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 19%
IV 18%
IV/IO/IM 8%
IV/IO/IM/PO 7%
IV/IM/PO 6%
IV/IO/IM/PO/ODT 6%
IV/IO 5%
IV/IM/ODT 3%
IM 3%
IV/IO/IM/ODT 3%
IV/IO/ODT 3%
IV/PO 3%
IV/IO/IM/IN/PO 2%
IV/ODT 2%
IV/IM/PO/SL 2%
IV/SL 2%
ODT 2%
PO 2%
IV/IM/IN 1%
IV/IO/IM/SL 1%
IV/IO/SL 1%
PO/ODT 1%
IM/ODT 1%
IV/IM/PO/ODT 1%
IV/IM/PO/SL/ODT 1%
IV/IM/SL 1%
IV/IO/IM/IN/ODT 1%
IV/IO/PO 1%
IV/IO/PO/SL 1%
SL/ODT 1%

United States EMS Protocol Census, n=154 protocols from 126 named agencies / 43 states, updated Oct 2026

Pediatricmg

86sources

77named agencies

32states

116entries

0kept as written

min	p25	median	p75	max
1	2	3	4	8

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

Routes

PO 26%
ODT 16%
IV/IM/ODT 8%
IV 7%
IV/IO/IM 6%
IV/IO/PO 6%
IV/IM 4%
PO/ODT 4%
IV/IM/PO/ODT 3%
IV/IM/PO 3%
SL 3%
IM 2%
IV/IO 2%
IV/IO/IM/PO 2%
IV/IO/ODT 2%
PO/SL 2%
IV/IO/IM/ODT 1%
IV/IO/SQ/SL 1%
IV/ODT 1%
IV/PO 1%
SL/ODT 1%
SQ/PO 1%

United States EMS Protocol Census, n=86 protocols from 77 named agencies / 32 states, updated Oct 2026

Adult, weight-basedmg/kg

6sources

5named agencies

5states

7entries

0kept as written

min	p25	median	p75	max
0.1	0.1	0.125	0.15	0.2

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 29%
IM 14%
IV 14%
IV/IM/PO 14%
IV/IO/IM/PO/ODT 14%
IV/IO/ODT 14%

United States EMS Protocol Census, n=6 protocols from 5 named agencies / 5 states, updated Oct 2026

Pediatrictablet

2sources

2named agencies

2states

2entries

0kept as written

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

Routes

PO 50%
SL 50%

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

Named agencies with a page173

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