How to poison lice on the head? - briefly
Apply a pediculicidal shampoo or lotion containing 1 % permethrin or a comparable FDA‑approved insecticide, following the product’s instructions for contact time and thorough rinsing. Ensure the scalp is wet, cover all hair sections, and repeat treatment after 7–10 days to eliminate any newly hatched nits.
How to poison lice on the head? - in detail
Effective chemical eradication of head‑lice infestations requires precise selection of an appropriate pediculicide, correct application technique, and thorough post‑treatment measures.
Choose a registered lice‑killing product containing one of the following active ingredients: permethrin (1 %), pyrethrin with piperonyl butoxide, malathion (0.5 %), benzyl alcohol (5 %), ivermectin (0.5 %), or spinosad (0.9 %). Verify that the formulation is approved for scalp use and read the safety data sheet to confirm suitability for the patient’s age and health status.
Apply the product according to the manufacturer’s instructions:
- Part hair into sections of 2–3 cm.
- Saturate each section, ensuring the scalp and hair shafts are fully covered.
- Leave the preparation on the scalp for the specified exposure time (usually 10–15 minutes).
- Rinse thoroughly with warm water; avoid using harsh shampoos that may inactivate the insecticide.
After the first treatment, repeat the application after seven days to eliminate newly hatched nymphs that survived the initial exposure. In severe cases, a third application may be required after another seven‑day interval.
Implement strict hygiene protocols to prevent reinfestation:
- Wash bedding, hats, scarves, and hair‑care accessories in hot water (≥ 60 °C) and dry on high heat.
- Seal non‑washable items in airtight plastic bags for two weeks.
- Vacuum carpets and upholstered furniture to remove detached lice and eggs.
Monitor the scalp for at least two weeks. Absence of live lice, nits, or itching indicates successful eradication. If live insects persist after two treatment cycles, consider switching to a product with a different active ingredient to address possible resistance.
Always store pediculicides out of reach of children and pets. In case of skin irritation, excessive redness, or respiratory symptoms, discontinue use immediately and seek medical advice.