Baby Safety / Compounds / Thiamethoxam

Is Thiamethoxam safe for babies and kids?

Moderate risk for kids

Infants are acutely vulnerable to Thiamethoxam due to immature acetylcholinesterase regulation, higher dermal absorption per unit body weight, and frequent floor-level exposure to residues.

What is thiamethoxam?

The IUPAC name is (NE)-N-[3-[(2-chloro-1,3-thiazol-5-yl)methyl]-5-methyl-1,3,5-oxadiazinan-4-ylidene]nitramide.

Also known as: (NE)-N-[3-[(2-chloro-1,3-thiazol-5-yl)methyl]-5-methyl-1,3,5-oxadiazinan-4-ylidene]nitramide, Actara, Cruiser, Diacloden.

IUPAC name
(NE)-N-[3-[(2-chloro-1,3-thiazol-5-yl)methyl]-5-methyl-1,3,5-oxadiazinan-4-ylidene]nitramide
CAS number
153719-23-4
Molecular formula
C8H10ClN5O3S
Molecular weight
291.72 g/mol
SMILES
CN1COCN(C1=N[N+](=O)[O-])CC2=CN=C(S2)Cl
PubChem CID
5821911

Risk for babies

Moderate risk

Infants are acutely vulnerable to Thiamethoxam due to immature acetylcholinesterase regulation, higher dermal absorption per unit body weight, and frequent floor-level exposure to residues.

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

Prenatal exposure to Thiamethoxam is associated with neurodevelopmental effects. Organophosphate/carbamate insecticides inhibit acetylcholinesterase, which plays a role in fetal brain development.

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

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

AgencyYearClassificationNotes
EU—Regulated substance
EPA CTX / EPA OPP—Not Likely to Be Carcinogenic in Humans
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 4 negative reports)
EPA CTX / Genetox—Genotoxicity: negative (Ames: negative, 0 positive / 4 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 thiamethoxam

  • 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 Thiamethoxam:

  • Physical/mechanical pest control (IPM)
    Trade-offs: More labor-intensive. May not be sufficient for severe infestations.
    Relative cost: 1.2-2×

Frequently asked questions

Is thiamethoxam safe for kids?

Infants are acutely vulnerable to Thiamethoxam due to immature acetylcholinesterase regulation, higher dermal absorption per unit body weight, and frequent floor-level exposure to residues.

What products contain thiamethoxam?

Thiamethoxam 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 thiamethoxam?

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 thiamethoxam?

Thiamethoxam has been classified by 4 agencies including EU, EPA CTX / EPA OPP, 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 Thiamethoxam in the baby app

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

Open in baby View raw API data

Sources (2)
  1. US EPA: Thiamethoxam — Interim Registration Review Decision and Bee Risk Assessment (2020) — regulatory
  2. EFSA: Neonicotinoids (Imidacloprid, Clothianidin, Thiamethoxam) — Assessment of Risks to Bees (Regulation (EU) 2018/785) (2018) — 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 →