Famotidine 40 mg/5 mL Pediatric Dose
Use this page when the bottle says famotidine 40 mg/5 mL or the family recognizes Pepcid. It explains the concentration and links into the main Pepcid calculator with the matching strength.
Source alignedOfficial label plus pediatric dosing safety checks.
Calculator handoffUses the parent medication calculator with presets.
Review policyHow PedsCalc reviews dosing pages
⚠️
Use the prescribed plan first
This page explains formulation-specific dose support. It does not choose the child's medication, indication, dose target, frequency, duration, maximum dose, or allergy plan.
Accuracy boundary
The formula and example are for concentration conversion after a clinician has chosen the dose. The linked calculator still requires weight entry and final clinical verification.
Quick answer
- Famotidine 40 mg/5 mL equals 8 mg/mL.
- mL per dose = prescribed famotidine mg per dose / 8.
- Very small infant volumes need careful oral-syringe measurement.
- Ongoing acid suppression should have a reassessment plan.
Famotidine 40 mg/5 mL formula
mL per dose = famotidine mg per dose / 8 mg per mL.
- Confirm whether the dose is written as mg per dose or mg/kg/day before converting.
- Kidney function and interacting medicines can matter for famotidine plans.
Famotidine quick conversion
0.25 mL
2 mg famotidine
0.5 mL
4 mg famotidine
1 mL
8 mg famotidine
2.5 mL
20 mg famotidine
5 mL
40 mg famotidine
Worked example
- Example only: a child has a prescribed famotidine dose of 4 mg.
- Famotidine 40 mg/5 mL equals 8 mg/mL.
- 4 mg / 8 mg per mL = 0.5 mL per dose.
Safety checks before measuring
- Use the exact concentration before measuring small volumes.
- Do not continue reflux medicine indefinitely without follow-up.
- Escalate vomiting blood, dehydration, breathing concerns, or poor weight gain.
Frequently asked questions
There are 8 mg in 1 mL because 40 mg divided by 5 mL equals 8 mg/mL.
Pepcid is a brand name for famotidine. The dose conversion depends on famotidine mg and the bottle concentration.