Famotidine Pediatric Dose Calculator
Weight-based famotidine dosing for children — 0.5 mg/kg/dose · every 12 hours · max 20 mg/dose. Enter age and weight for the dose in mg and syrup mL, tablets or injection volume.
Pediatric dosing
GERD / peptic symptoms (oral)
Acid suppression — IV (hospital) Hospital
Famotidine dose chart by age and weight
GERD / peptic symptoms (oral). Weights are WHO/IAP reference medians for age — always dose on the measured weight.
| Age | Weight | Dose (mg) | Suspension 40 mg/5 mL (where available) | Frequency |
|---|---|---|---|---|
| 3 months | 6.1 kg | 3.05 mg | 0.38 mL | Every 12 hours |
| 6 months | 7.6 kg | 3.8 mg | 0.48 mL | Every 12 hours |
| 9 months | 8.6 kg | 4.3 mg | 0.54 mL | Every 12 hours |
| 1 year | 9.3 kg | 4.65 mg | 0.58 mL | Every 12 hours |
| 18 months | 10.6 kg | 5.3 mg | 0.66 mL | Every 12 hours |
| 2 years | 11.8 kg | 5.9 mg | 0.74 mL | Every 12 hours |
| 3 years | 14.1 kg | 7.05 mg | 0.88 mL | Every 12 hours |
| 4 years | 16.2 kg | 8.1 mg | 1 mL | Every 12 hours |
| 5 years | 17.5 kg | 8.75 mg | 1.1 mL | Every 12 hours |
| 6 years | 19 kg | 9.5 mg | 1.2 mL | Every 12 hours |
| 8 years | 24.4 kg | 12.2 mg | 1.5 mL | Every 12 hours |
| 10 years | 31.1 kg | 15.6 mg | 1.9 mL | Every 12 hours |
| 12 years | 39.4 kg | 19.7 mg | 2.5 mL | Every 12 hours |
Strengths in the calculator
- Suspension 40 mg/5 mL (where available) (Oral)
- Tablet 20 mg (Oral)
- Tablet 40 mg (Oral)
- Injection 10 mg/mL (Intravenous)
Different strength on your bottle? Use “Different strength on the bottle?” under the result.
Safety
Pregnancy and breastfeeding
Legacy FDA category B. No evidence of harm; use if clearly needed.
Compatible with breastfeeding.
Clinical notes
H2-receptor antagonist; an option when a PPI is not preferred. Reduce the dose in renal impairment.
Adult and adolescent (≥40 kg) dose
20–40 mg — Every 12 hours (max 40 mg per dose, 80 mg per day).
Other names and brands
- India: Famocid
- USA: Pepcid
Brand examples only — products and strengths vary by country. Always check the label.
Frequently asked questions
What is the famotidine dose for children?
GERD / peptic symptoms (oral): 0.5 mg/kg/dose · every 12 hours · max 20 mg/dose. Usual duration: Short to medium course; review at 4–8 weeks. Always use the child's measured weight and check the strength on the bottle.
How many mL of suspension 40 mg/5 mL (where available) for an 11.8 kg child?
For GERD / peptic symptoms (oral), an 11.8 kg child (about 2 years) needs 5.9 mg per dose — 0.74 mL of Suspension 40 mg/5 mL (where available), every 12 hours. Recalculate with the child's actual weight.
From what age can famotidine be given?
Age range in PediaRx: ≥3 months – adult. The calculator does not calculate a dose below 3 months. Each indication can have its own age and weight limits, shown with its regimen.
Is famotidine safe in pregnancy?
Legacy FDA category B. No evidence of harm; use if clearly needed.
Sources and editorial process
- Famotidine — US prescribing information — DailyMed (U.S. National Library of Medicine)
Dosing data last updated 2026-09-27. PediaRx is built and maintained by Dr. Shounak Pal, MBBS (Medical Officer, Government of West Bengal, India — founder and developer of PediaRx). Every regimen is encoded with explicit units, maximum doses and age/weight limits and is checked by automated tests before publication. Report an error: hello@pediarx.com.
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Clinical disclaimer: reference tool for qualified health professionals. Verify every dose against current guidance and the product label before prescribing.
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