Dimethoate

MedEd Pesticide lists Dimethoate as an insecticide in the organophosphate class.

MedEd Pesticide Summarizes Dimethoate at a Glance

Type

Insecticide

Chemical class

Organophosphate

CAS number

60-51-5

Formula

C5H12NO3PS2

Molar mass

229.3 g/mol

EU status

Not approved as an active substance in the EU.

US status

Registered with EPA. 19 active products contain Dimethoate.

MedEd Pesticide Summarizes Dimethoate’s Toxicity Records

MedEd Pesticide holds 185 toxicity records for Dimethoate, from 7 sources. The headline values are below.

Oral LD50 in ratsAcute, swallowed

Lowest reported 60 mg/kg, median 105 mg/kg, from 2 records.

Dermal LD50Acute, skin contact

Lowest reported 353 mg/kg, median 676.5 mg/kg, from 2 records.

Lowest NOAELLong term, mammals

0.04 mg/kg-day in rat. Source: EFSA.

EPA signal wordsActive US products

Danger 0, Warning 16, Caution 3.

See all 185 Dimethoate toxicity records in the explorer. The records come from EPA’s Toxicity Values Database, and the methodology explains their limits.

MedEd Pesticide Reports Dimethoate’s EU Safety Reference Values

MedEd Pesticide finds no safety reference values for Dimethoate in the EU database.

MedEd Pesticide Lists Dimethoate’s EU Hazard Classification

MedEd Pesticide lists the harmonised EU hazard statements for Dimethoate below.

• H302 Harmful if swallowed
• H312 Harmful in contact with skin

MedEd Pesticide takes EU status, reference values and hazard classification from the EU Pesticides Database. MedEd Pesticide takes US status from EPA’s Pesticide Product Information System (dated 2026-10-13) and chemical identity from PubChem. Retrieved 2026-10-16. Values and approvals change, so check the source for the current entry. See the methodology and the glossary, or compare Dimethoate with another pesticide.

MedEd Pesticide. (2026). Dimethoate. https://mededpesticide.org/pesticides/dimethoate/ (accessed Month Day, Year)