How can pubic lice be killed? - briefly
Permethrin 1 % cream applied to the genital area for 10 minutes and then rinsed off eliminates the parasite; a single oral dose of ivermectin (200 µg/kg) provides an alternative systemic option.
How can pubic lice be killed? - in detail
Pubic lice infestations require immediate eradication to prevent prolonged discomfort and secondary infection. Effective elimination relies on chemical agents, mechanical extraction, and environmental sanitation.
Chemical pediculicides applied to the affected area provide rapid kill rates. Recommended over‑the‑counter products include:
- 1 % permethrin lotion, applied for 10 minutes before rinsing.
- 0.5 % pyrethrin combined with piperonyl‑butoxide, applied for 10 minutes.
- 0.5 % malathion, left on the skin for 8–12 hours, then washed off.
Prescription‑strength options address resistant strains:
- 5 % benzyl alcohol lotion, applied for 10 minutes, then removed.
- Oral ivermectin, 200 µg/kg single dose, with a repeat dose after one week.
- 0.9 % spinosad lotion, applied for 10 minutes, then washed.
Mechanical removal complements chemical treatment. Wet the area with warm water, then use a fine‑tooth comb or disposable lice removal device to pull live insects and nits from hair shafts. Shaving the affected region eliminates the habitat entirely, though it does not address eggs that may remain on skin.
Environmental control prevents re‑infestation. Wash clothing, towels, and bedding in hot water (≥ 60 °C) and dry on high heat for at least 30 minutes. Items that cannot be laundered should be sealed in plastic bags for two weeks or exposed to a freezer at –18 °C for 24 hours. Vacuum carpets and upholstered furniture, then discard vacuum bags.
Resistance to pyrethroids has been documented; therefore, treatment should be repeated after 7–10 days to target newly hatched nits. Follow‑up examination confirms the absence of live lice and viable eggs. If persistence occurs, switch to an alternative agent or combine chemical and mechanical methods.