|Molar mass||350.451 g/mol|
|Melting point||<25 °C|
|Boiling point||>290 °C|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Phenothrin, also called sumithrin, is a synthetic pyrethroid that kills adult fleas and ticks. It has also been used to kill head lice in humans. D-Phenothrin is used as a component of aerosol insecticides for domestic use. Phenothrin is often used with methoprene, an insect growth regulator that interrupts the insect's biological life cycle by killing the eggs.
Phenothrin is primarily used to kill fleas and ticks. It is also used to kill head lice in humans, but studies conducted in Paris, France and the United Kingdom have shown widespread resistance to phenothrin.
It is extremely toxic to bees. A U.S. Environmental Protection Agency (EPA) study found that 0.07 micrograms was enough to kill honey bees. It is also extremely toxic to aquatic life with a study showing concentrations of 0.03 ppb killing mysid shrimp. It has increased risk of liver cancer in rats and mice in long term exposure. It is poisonous to cats and dogs, with seizures and deaths being reported due to poisoning. Specific data on concentrations or exposure is lacking.
The EPA has not assessed its effect on cancer in humans. However, one study performed by the Mt. Sinai School of Medicine links sumithrin with breast cancer; the link made by sumithrin's affect on increasing the expression of a gene responsible for mammary tissue proliferation.
In 2005, the U.S. EPA canceled permission to use phenothrin in several flea and tick products, at the request of the manufacturer, Hartz Mountain Industries. The products were linked to a range of adverse reactions, including hair loss, salivation, tremors, and numerous deaths in cats and kittens. In the short term, the agreement called for new warning labels on the products.
As of March 31, 2006, the sale and distribution of Hartz's phenothrin-containing flea and tick products for cats has been terminated. However, EPA's product cancellation order did not apply to Hartz flea and tick products for dogs, and Hartz continues to produce many of its flea and tick products for dogs.
- JOURNAL OF PESTICIDE REFORM/ SUMMER 2003 • VOL. 23, NO. 2 http://www.pesticide.org/get-the-facts/pesticide-factsheets/factsheets/sumithrin
- Phenothrin and s-Methoprene; Product Cancellation Order, US Environmental Protection Agency[dead link]
- Phenothrin; Amendment to Terminate Use, US Environmental Protection Agency[dead link]
-  See also "dog" in the following EPA ruling: "Insect Growth Regulators: S-Hydroprene (128966), S-Kinoprene (107502), Methoprene (105401), S-Methoprene (105402) Fact Sheet". U.S. Environmental Protection Agency.
- Pyrethrins and Pyrethroids Fact Sheet - National Pesticide Information Center
- Pyrethrins and Pyrethroids Pesticide Information Profile - Extension Toxicology Network
- Phenothrin in the Pesticide Properties DataBase (PPDB)