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Pediatric Dosing

Anti-Histamine

DRUG DOSE PER DAY
mg/kg/day
(mg/lb/day)
DOSE BY AGE (Years)
(in mg per dose)
FREQ. OF ADMIN.
(Hours)
  12+ 6 - 12 2 - 6  
Diphenhydramine
(Benadryl, Benylin)
5 (2.3) 25 - 50 25 - 50 12.5 - 25 6 - 8
Cetirizine
(Zyrtec)
- 10 5 - 10 2.5 - 5 24
Hydroxyzine*
(Atarax, Vistaril)
2 (0.9) 25 - 100 10 - 25 5 - 10 6 - 8

Loratadine
(Claritin)

- 10 10 5 24

*Hydroxyzine suspension

weight(lbs) weight(kgs) 2mg/kg/day= Dose for Hydroxyzine
(10mg/5mL)
30 to 40 lbs 14 to 18kg 32 mg/day 5mL Q 8hrs prn
40 to 50 lbs 18 to 23kg 40 mg/day 5mL Q 6hrs prn
50 to 60 lbs 23 to 27kg 50 mg/day 5mL Q 6hrs prn
60 to 70 lbs 27 to 32kg 60 mg/day 10mL Q 8hrs prn
70 to 80 lbs 32 to 36kg (see dose by age below)  

SUPPLIED:
DRUG DOSAGE FORM STRENGTH
Diphenhydramine
(Benadryl, Benylin)
Elixir, Syrup 12.5 mg/5 ml
Hydroxyzine
(Atarax, Vistaril)
Syrup
Suspension
10 mg/5 ml
25 mg/5 ml
Cetirizine
(Zyrtec)
Syrup 5 mg/5 ml
Loratadine
(Claritin)
Syrup
Redi-Tab
5mg/5ml
10mg
Disclaimer: All of the information on this website is being presented as helpful reference material but should not be considered authoritative. There are no references because the information has been collected over the years piecemeal from notes, lectures, journals, textbooks, personal communications with other physicians and experience. You may disagree with some of it. Take it simply for what it is: information that I have found useful in my day to day practice as a clinical dermatologist and my hope is that you find it useful as well.