The drug, lindane, is safe when used as directed, the FDA said. But problems can arise when zealous parents pour too much on a child's head or reuse it because the child still itches after a first application, the agency said.
Many lice medicines recommend a second treatment in 9 to 10 days. This will kill any new nymphs that have hatched since the first treatment. Do not treat a person more than 2 times with the same medicine without talking to your doctor. Do not use conditioner for 10 days after any treatment.
In fact, it is best to not shampoo again for 2 days, in order to give the medicine time to work. The medicine will kill the live lice bugs, generally within 12 hours. Comb your child's hair. This is the MOST important step!
Environmentally relevant levels of pyrethroids—the class of pesticide that includes Permethrin—are also common in some household insecticide products. This means that adding lice shampoo, even the amount directed, to the level of pyrethroids already in a home can overexpose children to the pesticide.
Prescription-strength lice shampoos contain harsh pesticides that can cause dry scalp or even irritation and rashes. However, the shampoo itself hasn't been found to damage hair beyond temporary dryness since users are asked to nix hair conditioner after shampoo treatment of head lice.
Parents must be careful not to overuse a prescription drug for treating lice infestations because too much could cause neurological damage, the Food and Drug Administration said yesterday. The drug, lindane, is safe when used as directed, the FDA said.
The shampoo, cream rinse, or spray kills the live lice on the head but may not kill the nits. While the nits don't need to be removed from the hair, some people use a comb to remove nits after using lice treatment because they don't like the look of nits in the hair.
Generally, if no live crawling insects are seen three weeks after the treatment, it's safe to assume that they are gone. Nits would have hatched by that time if they were alive. Nits and their shells may remain in the hair for some time but won't be viable.
After beginning treatment, continue combing at least once a day while you still see live lice. Then continue to comb your child's hair every three to four days for at least three weeks after you see your last live louse. This is because nits can take up to two weeks to hatch.
There are over-the-counter (OTC) lice treatments that are effective at getting rid of lice, including Rid and Nix. If lice return, a doctor may prescribe the shampoo Lindane, (which the American Academy of Pediatrics warns against using as a first treatment in children), or lotions such as Sklice, Ulesfia, or Ovide.
The head lice may have become resistant to the treatment. If the treatment used does not kill the head lice, your health care provider and pharmacist can help you be sure the treatment was used correctly and may recommend a completely different product if they think the head lice are resistant to the first treatment.
A second treatment is recommended 9 to 10 days after the first treatment to kill any newly hatched lice before they can produce new eggs.
Therefore, an appropriately timed second treatment is usually necessary to kill nymphs after they hatch but before they become adult lice. Some studies suggest that re-treating 7 to 9 days after the first treatment is the ideal time for a second treatment, but other re-treatment schedules exist.
4 You cannot get rid of lice with a hair brush or with a hair dryer. 4 The best way to find head lice is by using a fine toothed lice comb on hair that is dry, wet or wet with conditioner.
Detection combs are special fine-toothed plastic combs that you can buy from your local pharmacy, supermarket or online. A comb with flat-faced teeth and a tooth spacing of 0.2 to 0.3mm is best. Detection combing can be carried out on dry or wet hair.
First, wash the hair with a regular shampoo. Then, towel dry it before using the anti-lice creme. Do not use a conditioner or creme rinse after shampooing. Reason: It will interfere with Nix.
Ivermectin (Sklice).
This lotion kills most head lice, even just-hatched lice, with just one use. You don't need to comb out lice eggs (nits). Children ages 6 months and older can use this product.
But unfortunately, the nits will not simply fall out your hair. The lice themselves take 7 to 11 days to hatch, so after that what is attached to the hair is the empty eggshell or the dead nit. These will stay attached to the hair and as the hair grows you will find them further and further down the hair shaft.
An adult louse is grayish white or tan and about the size of a small sesame seed. Lice move fast, so you're actually more likely to see their eggs than the lice themselves. Louse eggs are called nits. Nits look sort of like dandruff, except they don't brush or fall off as easily as dandruff.
By comparison, the researchers found that a normal hair dryer aimed at the base of hair, divided into 20 large sections, killed 55.3% of hatched lice and 97.9% of lice eggs after 30 minutes of blow drying.
The best way to comb out lice is to do it on wet hair.
Nits may remain after lice have gone. They are empty eggshells and stick strongly to hair. They will eventually fall out. If you prefer, a fine-toothed 'nit comb' can remove them.
Adult lice can't live longer than 24 hours or so on nonhuman surfaces like carpets, hardwood floors, clothing, furniture, sports helmets, headphones, or hair accessories. However, if you have identified lice in your home, isolate and wash those items and areas within at least 72 hours.
Dehydration: Applying hot air with a special machine operated by a professional can cause dehydration, possibly killing the eggs and lice. Household cleaning: Lice usually can't live more than a day without feeding off a human scalp, and the eggs can't survive if they aren't incubated at the temperature in the scalp.
Either washing done with a water temperature of at least 50 degrees C or drying is necessary to kill head lice and nits.