The number in parentheses following dilution directions refers to the Permethrin concentrate in the diluted product. INDOOR USE. SURFACE SPRAY: For initial cleanup of severe insect infestation, dilute at a rate of 1 part concentrate in 19 parts water (6.4 ounces per gallon) (0.5%). Nobody wants to see lice on their pet, any more than they do on their kids. Lice cause intense itching and scratching, and can make pets a bit crazy with all the crawling and biting. Head lice are tiny insects that can be found on various parts of the body, including the head, eyebrows, and eyelashes. The most common symptom with head lice is itching. Permethrin lotion which is used to treat lice, comes in a container that holds only one treatment. Use as much of the medicine as you need and discard any remaining lotion properly. Permethrin is used to treat scabies ('mites that attach themselves to the skin) in adults and children 2 months of age and older. Over-the-counter permethrin is used to treat lice (small insects that attach themselves to the skin on the head) in adults and children 2 months of age and older. I've used this product to spray my clothing and equipment for trips to mosquito and tick infested areas. It lasts for up to 6 weeks and is the most effective product I have found--also, it keeps the bug spray off my body. How To Use Directions. Adults and children 2 months old and older. Inspect. Check each household member with a magnifying glass in bright light for lice/nits (eggs) Abstract. Head lice infestation is associated with limited morbidity but causes a high level of anxiety among parents of school-aged children. Since the 2010 clinical report on head lice was published by the American Academy of Pediatrics, newer medications have been approved for the treatment of head lice. Permethrin is an anti-parasite medication. Permethrin topical (for the skin) is used to treat head lice and scabies. Permethrin topical may also be used for other purposes not listed in this medication guide. Deet repellents work by evaporation, creating a shield a few inches above the area of application. The presence of the repellent vapor confuses insects so they can’t locate a target host.