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You are here: NPIC Home Page Pesticide Ingredients Active Ingredients Methoprene

Methoprene is an insect growth regulator that behaves like an important hormone in insects. By acting like an insect hormone it interferes with insect growth and development. Methoprene is a common ingredient found in flea treatments for dogs and cats, mosquito control products, insect baits, and home insect sprays or foggers. It can also be used on food including stored grains, corn, mushrooms, peanuts, cattle, and cereals.

General Questions about Methoprene

What is methoprene? What are some products that contain methoprene? How does methoprene work? How might I be exposed to methoprene? What are some signs and symptoms from a brief exposure to methoprene? What happens to methoprene when it enter the body? Is methoprene likely to contribute to the development of cancer? Has anyone studied non-cancer effects from long-term exposure to methoprene? Are children more sensitive to methoprene than adults? What happens to methoprene in the environment? Can methoprene affect birds, fish, and other wildlife?

General Fact Sheet	Methoprene Video (4:40 min.) More Videos
Precautions for Using Spot-on Flea and Tick Products Podcast (2:38 min., 4.95MB)	What Should I Do During Mosquito Spraying? Podcast (1:39 min., 1.50MB)

If you have questions about this, or any pesticide-related topic, please call NPIC at 1-800-858-7378 (8:00am - 12:00pm PST), or email at npic@ace.orst.edu.

Related Topics:

What are pests?

What are pesticides?

Please read our disclaimer | Contact us | About NPIC | En español

NPIC provides objective, science-based information about pesticides and pesticide-related topics to enable people to make informed decisions. NPIC is a cooperative agreement between Oregon State University and the U.S. Environmental Protection Agency (cooperative agreement #X8-83947901). The information in this publication does not in any way replace or supersede the restrictions, precautions, directions, or other information on the pesticide label or any other regulatory requirements, nor does it necessarily reflect the position of the U.S. EPA.