Contact: research@protoquiz.com

Indication

Diphenhydramine for Nausea / vomiting

37 sources30 named agencies22 statesas of 2026-10-31

Adult dosing has a median of 25 mg across 37 published protocols, with the middle half between 12.5 and 25.

37sources
30named agencies
22states
66entries
28named here

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

Adultmg

37sources
30named agencies
22states
40entries
0kept as written
minp25medianp75max
12.512.5252550

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 35%
  • IV/IO/IM 33%
  • IV 20%
  • IV/IO/IM/PO 5%
  • IM 3%
  • IV/IO 3%
  • PO 3%

United States EMS Protocol Census, n=37 protocols from 30 named agencies / 22 states, updated Oct 2026

Pediatric, weight-basedmg/kg

23sources
19named agencies
14states
25entries
0kept as written
minp25medianp75max
0.51111.25

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 44%
  • IV/IO/IM 32%
  • IV 8%
  • IV/IO/IM/PO 8%
  • IM 4%
  • IV/IO 4%

United States EMS Protocol Census, n=23 protocols from 19 named agencies / 14 states, updated Oct 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

  • PO 100%

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

Named agencies with a page28

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

Training reference compiled from published protocols. Not a clinical order. Verify with your agency and medical director.