Methomyl

MedEd Pesticide lists Methomyl as an insecticide in the carbamate class.

MedEd Pesticide Summarizes Methomyl at a Glance

Type

Insecticide

Chemical class

Carbamate

CAS number

16752-77-5

Formula

C5H10N2O2S

Molar mass

162.21 g/mol

EU status

Not approved as an active substance in the EU.

US status

Registered with EPA. 12 active products contain Methomyl.

MedEd Pesticide Summarizes Methomyl’s Toxicity Records

MedEd Pesticide holds 228 toxicity records for Methomyl, from 8 sources. The headline values are below.

Oral LD50 in ratsAcute, swallowed

Lowest reported 14.7 mg/kg, median 23.5 mg/kg, from 9 records.

Dermal LD50Acute, skin contact

Lowest reported 1600 mg/kg, median 5000 mg/kg, from 5 records.

Lowest NOAELLong term, mammals

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

EPA signal wordsActive US products

Danger 11, Warning 0, Caution 1.

See all 228 Methomyl toxicity records in the explorer. The records come from EPA’s Toxicity Values Database, and the methodology explains their limits.

MedEd Pesticide Reports Methomyl’s EU Safety Reference Values

MedEd Pesticide takes these values from the EU, which sets them when it assesses an active substance. They are expressed per kilogram of body weight.

ADIAcceptable daily intake

0.0025 mg/kg bw/dayThe amount a person can take in every day over a lifetime without appreciable health risk.

ARfDAcute reference dose

0.0025 mg/kg bwThe amount that can be taken in over a short period, such as one meal or one day, without appreciable health risk.

AOELAcceptable operator exposure level

0.0025 mg/kg bw/dayThe level of exposure for people who apply the pesticide at which no adverse effect is expected.

MedEd Pesticide Lists Methomyl’s EU Hazard Classification

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

• H300 Fatal if swallowed
• H400 Very toxic to aquatic life
• H410 Very toxic to aquatic life with long-lasting effects

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 Methomyl with another pesticide.

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