Baby Safety / Compounds / Mebendazole

Is Mebendazole 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 Mebendazole poses heightened risk.

What is mebendazole?

The IUPAC name is methyl N-(6-benzoyl-1H-benzimidazol-2-yl)carbamate.

Also known as: methyl N-(6-benzoyl-1H-benzimidazol-2-yl)carbamate, Vermox, Pantelmin, Telmin.

IUPAC name
methyl N-(6-benzoyl-1H-benzimidazol-2-yl)carbamate
CAS number
31431-39-7
Molecular formula
C16H13N3O3
Molecular weight
295.29 g/mol
SMILES
COC(=O)NC1=NC2=C(N1)C=C(C=C2)C(=O)C3=CC=CC=C3
PubChem CID
4030

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 Mebendazole 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

Mebendazole 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

3 regulatory and scientific bodies have classified Mebendazole. The classifications differ — that's the data.

AgencyYearClassificationNotes
IARC2023Not evaluated by IARC as carcinogenic — mebendazole is an FDA OTC-approved benzimidazole anthelmintic (US) for pinworm, hookworm, roundworm, and whipworm; WHO Essential Medicine; pregnancy Category C (teratogenic in animals at high doses; not recommended in first trimester); anti-tumor repurposing research active
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 2 positive / 0 negative reports)

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 mebendazole

  • 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 Mebendazole:

  • 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 mebendazole 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 Mebendazole poses heightened risk.

What products contain mebendazole?

Mebendazole 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 mebendazole?

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.

Why do regulators disagree about mebendazole?

Mebendazole has been classified by 3 agencies including IARC, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. 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. See the regulatory consensus table on this page for the full picture.

See Mebendazole in the baby app

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

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Sources (1)
  1. Mebendazole FDA OTC Emverm Pinworm Roundworm Hookworm Whipworm; WHO Essential Medicine STH MDA; Beta-Tubulin Colchicine Binding Site Benzimidazole; Low Oral Bioavailability <10%; Pregnancy Category C Teratogenic Animal; Anti-Tumor Repurposing Glioblastoma Colorectal; CYP1A2 Phenytoin Drug Interaction; IARC Not Evaluated; EU Prescription Medicine (2023) — 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 →