While permethrin may be marketed as an insect repellent, it does not prevent insects from landing. Instead it works by incapacitating or killing insects before they can bite. In pet flea preventive collars or treatment (safe for use on dogs but not cats)
In timber treatment

Medical use
Permethrin is available for topical use as a cream or lotion. It is indicated for the treatment and prevention in exposed individuals of head lice and treatment of scabies.For treatment of scabies: Adults and children older than 2 months are instructed to apply the cream to the entire body from head to the soles of the feet. Wash off the cream after 8–14 hours. In general, one treatment is curative.For treatment of head lice: Apply to hair, scalp, and neck after shampooing. Leave in for 10 minutes and rinse. Avoid contact with eyes. Pest control / effectiveness and persistence
In agriculture, permethrin is mainly used on cotton, wheat, maize, and alfalfa crops. Its use is controversial because, as a broad-spectrum chemical, it kills indiscriminately; as well as the intended pests, it can harm beneficial insects, including honey bees, as well as cats and aquatic life.Permethrin kills ticks and mosquitoes on contact with treated clothing. A method of reducing deer tick populations by treating rodent vectors involves stuffing biodegradable cardboard tubes with permethrin-treated cotton. Mice collect the cotton for lining their nests. Permethrin on the cotton kills any immature ticks feeding on the mice. Permethrin is used in tropical areas to prevent mosquito-borne disease such as dengue fever and malaria.
Sialuria is a group of disorders resulting in an accumulation of free sialic acid. One type, known as the Finnish type or Salla disease has been described in northeastern Finland and is due to a mutation in gene SLC17A5 on chromosome 6q4-15. The "French type sialuria" (Online Mendelian Inheritance in Man (OMIM): 269921), is a very rare condition presenting in infancy with failure to thrive, yellowish skin, large liver, low blood count, recurrent chest infections, bowel upsets, dehydration and characteristic facial features. References


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