How to apply permethrin against lice? - briefly
Apply a 1 % permethrin lotion to dry, unwashed hair, covering the scalp and all hair shafts, leave it on for 10 minutes, then rinse thoroughly. Repeat the application after 7–10 days to eradicate any newly hatched lice.
How to apply permethrin against lice? - in detail
Permethrin is a synthetic pyrethroid formulated as a 1 % lotion or shampoo for eliminating head‑lice infestations. Proper use maximizes efficacy and reduces the risk of re‑infestation.
First, verify that the product is intended for lice and read the label for any age restrictions. For children under two years, many formulations are contraindicated; consult a health professional if uncertainty exists.
Prepare the affected person by washing hair with a regular shampoo, rinsing thoroughly, and towel‑drying until damp but not dripping. Apply the permethrin preparation as follows:
- Dispense enough lotion to saturate all hair and scalp.
- Using fingertips, massage the product into the scalp, ensuring coverage from the hairline to the nape.
- Distribute the liquid evenly through the length of the hair, separating strands to reach hidden areas.
- Leave the medication on for the time specified on the packaging, typically 10 minutes.
- Rinse hair with warm water; do not use conditioner or other hair products afterward.
After treatment, remove live lice and nits manually. A fine‑toothed comb (nit comb) should be used on damp hair:
- Section hair into manageable sections.
- Place the comb at the scalp and pull through each strand slowly, wiping the comb after each pass.
- Continue until the entire head has been combed, then wash the comb in hot, soapy water.
Repeat the combing process at 24‑hour intervals for three days to capture any newly hatched lice. A second application of permethrin is recommended after seven days to eliminate any surviving eggs that may have survived the first treatment.
Environmental measures complement chemical therapy:
- Wash bedding, hats, scarves, and hair accessories in hot water (≥ 60 °C) and tumble‑dry on high heat.
- Seal non‑washable items in a plastic bag for two weeks.
- Vacuum carpets and upholstered furniture to remove detached nits.
Avoid re‑exposure by instructing all household members to refrain from sharing personal items such as combs, brushes, hats, or pillows until the treatment course is complete.
If symptoms persist beyond two weeks, or if an allergic reaction (rash, itching, swelling) occurs, discontinue use and seek medical advice promptly.