Baby Safety / Compounds / Pirimiphos-methyl

Is Pirimiphos-methyl safe for babies and kids?

Elevated risk for kids

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

What is pirimiphos-methyl?

The IUPAC name is 4-dimethoxyphosphinothioyloxy-N,N-diethyl-6-methylpyrimidin-2-amine.

Also known as: 4-dimethoxyphosphinothioyloxy-N,N-diethyl-6-methylpyrimidin-2-amine, PIRIMIPHOS METHYL, Pyrimiphos methyl, Pirimifosmethyl.

IUPAC name
4-dimethoxyphosphinothioyloxy-N,N-diethyl-6-methylpyrimidin-2-amine
CAS number
29232-93-7
Molecular formula
C11H20N3O3PS
Molecular weight
305.34 g/mol
SMILES
CCN(CC)C1=NC(=CC(=N1)OP(=S)(OC)OC)C
PubChem CID
34526

Risk for babies

Elevated risk

Infants are acutely vulnerable to Pirimiphos-methyl 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 Pirimiphos-methyl 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 Pirimiphos-methyl. The classifications differ — that's the data.

AgencyYearClassificationNotes
EPA CTX / EPA OPP—Not Yet Determined
EPA CTX / Skin-Eye—Eye Irritation: Category 2 (score: high)
EPA CTX / Skin-Eye—Skin Irritation: Not classified (score: low)
EPA CTX / Skin-Eye—Eye Irritation: Category 6.4A (Category 2A) (score: high)

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 pirimiphos-methyl

  • 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 Pirimiphos-methyl:

  • 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 pirimiphos-methyl safe for kids?

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

What products contain pirimiphos-methyl?

Pirimiphos-methyl 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 pirimiphos-methyl?

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 pirimiphos-methyl?

Pirimiphos-methyl has been classified by 4 agencies including EPA CTX / EPA OPP, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, EPA CTX / Skin-Eye, 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 Pirimiphos-methyl in the baby app

Look up products containing pirimiphos-methyl, compare to alternatives, and explore the full data record.

Open in baby View raw API data

Sources (2)
  1. US EPA: Pirimiphos-methyl Registration Eligibility Decision — Dietary Risk Assessment, Grain Storage Residues, and Ecological Risk (1999) (1999) — regulatory
  2. WHO/FAO: JMPR Monograph — Pirimiphos-methyl Residues in Food, ADI, and WHO Vector Control Use (2003) (2003) — 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 →