Famotidine Pediatric Dose Calculator

Weight-based famotidine (Pepcid®) dosing for children: GERD, erosive esophagitis, and peptic ulcer disease — updated US guidelines 2026.

The famotidine pediatric dose calculator helps parents, caregivers, and clinicians determine safe weight-based dosing (mg/kg) for children aged 1–16 years. Acid reflux, heartburn, and peptic ulcers affect thousands of children across the United States. Using an accurate, evidence-based tool reduces medication errors and provides a reliable starting point for pediatric H2-blocker therapy. This 2026 update integrates the latest pediatric gastroenterology guidelines and FDA-approved weight bands.

Pediatric famotidine dosage tool

Child's weight

💊 Recommended famotidine dose (once daily for GERD / acid reduction)

Daily dose range: 11 – 22 mg

Oral suspension (40mg/5mL): 1.4 – 2.8 mL per day

Maximum pediatric dose: 40 mg/day (weight >40 kg)

Standard starting: 0.5 mg/kg for GERD; up to 1 mg/kg for ulcers. Always verify with pediatrician.

Based on peer-reviewed guidelines: 0.5–1 mg/kg/dose, max 40 mg. For infants <3 months or renal impairment, consult specialist.

Famotidine pediatric dosing table by weight (2026)

Weight (kg)	Weight (lbs)	Low dose (0.5 mg/kg)	High dose (1 mg/kg)	Suspension volume* (mL)
5 kg	11 lbs	2.5 mg	5 mg	0.3 – 0.6 mL
10 kg	22 lbs	5 mg	10 mg	0.6 – 1.3 mL
15 kg	33 lbs	7.5 mg	15 mg	0.9 – 1.9 mL
20 kg	44 lbs	10 mg	20 mg	1.3 – 2.5 mL
25 kg	55 lbs	12.5 mg	25 mg	1.6 – 3.1 mL
30 kg	66 lbs	15 mg	30 mg	1.9 – 3.8 mL
35 kg	77 lbs	17.5 mg	35 mg	2.2 – 4.4 mL
40+ kg	88+ lbs	20 mg	40 mg (max)	2.5 – 5.0 mL

*Based on famotidine oral suspension 40 mg per 5 mL (8 mg/mL). Always use calibrated dosing syringe.

Exclusive insights: Pediatric famotidine timeline & safety checklist

FDA milestones for famotidine in children

2001 – FDA approves famotidine for pediatric GERD (1–16 years).
2014 – Oral suspension formulation available (40mg/5mL) simplifies infant/child dosing.
2024-2026 – Updated ACG guidelines reinforce weight-based dosing with max 40 mg/day; renal dose adjustment recommended for CrCl <30 mL/min.

Quick safety checklist for caregivers (US)

✅ Verify weight in kg using a recent scale (no estimation).
✅ Use the lowest effective dose (0.5 mg/kg) for mild reflux.
✅ Double-check concentration: 40mg/5mL or 20mg tablets.
✅ Do not exceed 40 mg per day, even for heavier adolescents.
✅ If child has kidney disease, ask physician for adjusted frequency (every 48h).
✅ Famotidine may be given with or without food; store suspension at room temperature.

Pro tip 2026: For children with nighttime acid breakthrough, a single bedtime dose (1 mg/kg) is more effective than divided doses — always follow MD guidance.

Renal adjustment & special populations

Famotidine is primarily excreted unchanged in urine. For pediatric patients with estimated glomerular filtration rate (eGFR) <30 mL/min/1.73m², the dosing interval should be extended to every 48 hours at the same mg/kg dose. No dose reduction is needed for mild to moderate impairment. Infants younger than 3 months have reduced clearance; typical starting dose is 0.5 mg/kg once daily, but only under close pediatric supervision.

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Frequently asked questions (Famotidine pediatric dosing)

❓ Is famotidine safe for infants under 1 year?
Famotidine is FDA-approved for children ≥1 year for GERD. For infants <1 year, off-label use exists but requires strict pediatrician supervision due to immature kidney function. Always consult before giving.

❓ What’s the maximum famotidine dose for a child weighing 30 kg?
Maximum daily dose is 40 mg. For 30 kg child, high dose (1 mg/kg) is 30 mg — well within safe limit. Never exceed 40 mg/24h.

❓ Can I give famotidine twice daily?
For erosive esophagitis or duodenal ulcers, some pediatric GI specialists prescribe 0.5 mg/kg twice daily (max 20 mg BID). However, once-daily dosing is standard for GERD. Confirm indication with your doctor.

❓ How do I convert my child’s weight from pounds to kg for dosing?
Divide pounds by 2.2046. Our calculator above automatically converts. Example: 44 lbs ÷ 2.2046 = 20 kg → famotidine dose 10–20 mg daily.

❓ Does famotidine interact with other pediatric medications?
Famotidine has few drug interactions, but it may reduce absorption of ketoconazole, itraconazole, or iron supplements (separate by 2 hours). Always disclose all meds to pharmacist.

❓ What if my child vomits after taking famotidine?
If vomiting occurs within 30 minutes, you may repeat the dose. After 30–60 minutes, absorption likely occurred; skip until next scheduled dose. Do not double dose.

Medical & legal disclaimer – famotidine pediatric use

TotalCalcHub provides this famotidine pediatric dose calculator as an educational reference tool. Dosing recommendations are based on standard pediatric guidelines (0.5–1 mg/kg/day) but do not replace professional medical advice. Always consult a pediatrician, pharmacist, or gastroenterologist before administering any medication. Individualized therapy depends on child's medical history, renal function, and concomitant conditions. By using this calculator, you agree that TotalCalcHub is not liable for any medication errors or adverse events.