Baby Safety / Compounds / Famotidine

Is Famotidine safe for babies and kids?

Moderate risk for kids

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Famotidine poses heightened risk.

What is famotidine?

The IUPAC name is 3-[[2-(diaminomethylideneamino)-1,3-thiazol-4-yl]methylsulfanyl]-N'-sulfamoylpropanimidamide.

Also known as: 3-[[2-(diaminomethylideneamino)-1,3-thiazol-4-yl]methylsulfanyl]-N'-sulfamoylpropanimidamide, Pepdul, Gastridin, Pepdine.

IUPAC name
3-[[2-(diaminomethylideneamino)-1,3-thiazol-4-yl]methylsulfanyl]-N'-sulfamoylpropanimidamide
CAS number
76824-35-6
Molecular formula
C8H15N7O2S3
Molecular weight
337.5 g/mol
SMILES
C1=C(N=C(S1)N=C(N)N)CSCCC(=NS(=O)(=O)N)N
PubChem CID
5702160

Risk for babies

Moderate risk

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Famotidine poses heightened risk.

Neonates and infants up to 12 months have incomplete blood-brain barrier development, immature Phase I/II metabolic enzymes (particularly CYP3A4, UGT1A1), and higher gastrointestinal permeability. Equivalent doses produce higher internal concentrations and longer residence times.

What to do: Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

Risk for pregnant and nursing people

Elevated risk

Famotidine poses pregnancy risk through potential teratogenicity, altered pharmacokinetics (increased blood volume, changed CYP activity), and placental transfer. FDA pregnancy category should be evaluated.

Suspected reproductive toxicant (GHS H361) or suspected endocrine disruptor. Precautionary approach warranted. Animal studies or limited human data suggest developmental toxicity potential.

What to do: Minimize exposure during pregnancy and lactation. Consult healthcare provider regarding specific risks. Consider alternative products with lower hazard profiles.

Regulatory consensus

1 regulatory bodyhas classified Famotidine.

AgencyYearClassificationNotes
IARC—Not classifiedIARC has not classified famotidine

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where kids encounter famotidine

  • Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
  • Occupational Environments — Factories, Warehouses, Transportation vehicles

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Famotidine:

  • Alternative drug class; Non-pharmacological therapy; Lowest effective dose
    Trade-offs: Direct chemical substitution requires verification that the replacement does not introduce new hazards (regrettable substitution). Conduct full hazard assessment of proposed alternative before adoption.
    Relative cost: 1.2-2×

Frequently asked questions

Is famotidine safe for kids?

Infants have immature drug-metabolizing enzymes (CYP450 ontogeny), reduced renal clearance, and different volume of distribution. Accidental exposure or breast milk transfer of Famotidine poses heightened risk.

What products contain famotidine?

Famotidine appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).

What should I do if my child is exposed to famotidine?

Minimize infant exposure through source control. For breastfeeding mothers: reduce maternal exposure. For formula-fed infants: use certified low-migration bottles and verified water sources. Consult pediatrician regarding any concerns.

See Famotidine in the baby app

Look up products containing famotidine, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (2)
  1. FDA Drug Label and OTC Monograph: Famotidine (Pepcid/Pepcid AC) — H2 receptor antagonist; renal elimination; no NDMA formation; ranitidine alternative; pediatric approved age 1+; 0.5 mg/kg/day dosing; COVID clinical trial no benefit; Pregnancy Category B (2020) — regulatory
  2. American Association of Poison Control Centers (AAPCC): National Poison Data System Annual Report — Pediatric cocaine/stimulant exposures; body packing emergencies; levamisole agranulocytosis; accidental child ingestion outcomes (2022) (2022) — regulatory

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →