Many people use permethrin on clothing as a way to prevent tick and mosquito bites. But not everyone applies it correctly. Consumer Reports has the tips for safe and effective use. A Complete Guide to Permethrin Insecticide. By InsectCop; Last updated on September 13, 2018; If you’ve had a spider or ant problem in your home, you may have used permethrin insecticide to kill the bothersome intruders. Permethrin is a member of the pyrethroid family and is a synthetic agent that mimics the pyrethrin of pyrethrum flowers. In short, permethrin is toxic to insects when they. Permethrin (Topical Route) Print. Sections. Description and Brand Names; Before Using; Proper Use; Precautions; Side Effects; Products and services. Free E-newsletter Subscribe to Housecall. Our general interest e-newsletter keeps you up to date on a wide variety of health topics. Sign up now. Precautions. Drug information provided by: IBM Micromedex. To prevent reinfection or spreading of. Leave the permethrin cream on the skin for 8 to 14 hours. Wash off by taking a shower or bath. Change into clean clothes. After treatment, itching may continue for up to 4 weeks. Dosing. The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information. Learn how to create an emulsion of permethrin to spray your home with. Permethrin is a cheap, powerful, long lasting (2-3 months) insecticide that adheres to nearly any surface and resists weather. Permethrin Cream, 5% is safe and effective in pediatric patients two months of age and older. Safety and effectiveness in infants less than two months of age have not been established. Geriatric Use. Clinical studies of Permethrin cream, 5% did not identify sufficient numbers of subjects aged 65 and over to allow a definitive statement regarding whether elderly subjects respond differently. Follow the directions on your prescription label or the package label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Use permethrin exactly as directed. Do not use more or less of it or use it more often than prescribed by your doctor. Permethrin should only be used on the skin or hair and scalp. Avoid getting permethrin in your eyes, nose, ears, mouth. How to Mix Permethrin By. Permethrin is available in a 13.3 percent solution and in a 10 percent solution. Both have different uses and different application specifications. The 13.3 percent solution is used to help control outside flying and crawling pests, such as house flies, mosquitoes, gnats, ants, ticks, wasps, hornets, fire ants and many other insect varieties. The 10 percent.