Baby Safety / Compounds / Warfarin

Is Warfarin 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 Warfarin poses heightened risk.

What is warfarin?

The IUPAC name is 4-hydroxy-3-(3-oxo-1-phenylbutyl)chromen-2-one.

Also known as: 4-hydroxy-3-(3-oxo-1-phenylbutyl)chromen-2-one, Coumafene, Zoocoumarin, Coumafen.

IUPAC name
4-hydroxy-3-(3-oxo-1-phenylbutyl)chromen-2-one
CAS number
81-81-2
Molecular formula
C19H16O4
Molecular weight
308.3 g/mol
SMILES
CC(=O)CC(C1=CC=CC=C1)C2=C(C3=CC=CC=C3OC2=O)O
PubChem CID
54678486

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 Warfarin 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

Warfarin 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 Warfarin.

AgencyYearClassificationNotes
FDA—Approved anticoagulantApproved for prevention and treatment of venous thromboembolism (DVT, PE), atrial fibrillation thromboembolism prevention, mechanical heart valve prophylaxis, and post-MI stroke reduction

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 warfarin

  • 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 Warfarin:

  • 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 warfarin 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 Warfarin poses heightened risk.

What products contain warfarin?

Warfarin 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 warfarin?

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 Warfarin in the baby app

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

Open in baby View raw API data

Sources (2)
  1. FDA Prescribing Information: Warfarin (Coumadin) — vitamin K antagonist; narrow therapeutic index; bleeding risk; INR monitoring; vitamin K1/PCC antidotes; CYP2C9/VKORC1 pharmacogenomics; many drug-food interactions; DOAC comparison (2023) (2023) — regulatory
  2. ASPCA Animal Poison Control Center: Anticoagulant Rodenticide Toxicosis — warfarin vs superwarfarins (brodifacoum/bromadiolone); relay toxicosis; prolonged vitamin K1 treatment; coagulopathy signs; PT/APTT; transfusion; 4–6 week treatment duration (2023) (2023) — veterinary

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 →