Methoprene is a juvenile hormone (JH) analog which acts as a growth regulator when used as an insecticide (IRAC group 7A).

[3] Methoprene is used in the production of a number of foods, including meat, milk, mushrooms, peanuts, rice, and cereals.

[4] Methoprene is commonly used as a mosquito larvicide used to help stop the spread of the West Nile virus.

According to its materials safety data sheet (MSDS), methoprene is a material that may be irritating to the mucous membranes and upper respiratory tract; may be harmful by inhalation, ingestion, or skin absorption; may cause eye, skin, or respiratory system irritation; and is very toxic to aquatic life.

[5] The GHS signal word is "Warning", with notes such as "P273: Avoid release into the environment" and "P391: Collect spillage".