What is the name of shampoo against lice? - briefly
The primary over‑the‑counter lice‑treatment shampoo is Nix, which contains permethrin; an FDA‑approved alternative is Rid, formulated with pyrethrins. Both are designed to eradicate head lice when applied according to the label instructions.
What is the name of shampoo against lice? - in detail
The shampoo specifically formulated to eliminate head‑lice infestations is most often identified by its active ingredient and brand designation. In the United States, the primary over‑the‑counter options are:
- Permethrin 1 % shampoo – sold under the brand name Nix. Permethrin interferes with the nervous system of lice, causing paralysis and death. Application involves wetting hair, massaging the product for ten minutes, rinsing, and repeating after seven days to target newly hatched nymphs.
- Pyrethrins + piperonyl butoxide shampoo – marketed as Rid. Pyrethrins act on lice nerves; piperonyl butoxide enhances penetration. The regimen mirrors that of permethrin, with a ten‑minute contact time and a second treatment after one week.
- Dimethicone‑based shampoo – available as Licefreee and Ulesfia. Dimethicone coats lice and suffocates them. Recommended use includes a five‑minute soak, thorough rinsing, and a repeat application after nine days.
- Benzyl alcohol 5 % lotion – sold under the name Ulesfia (though technically a lotion, it is often used in shampoo‑like applications). It kills lice through asphyxiation without affecting eggs; a single 10‑minute exposure suffices, with a follow‑up treatment after nine days.
Key considerations for each product:
- Efficacy – Permethrin and pyrethrin formulations achieve 80‑90 % kill rates on live lice but may leave some eggs viable; the second application addresses this gap. Dimethicone and benzyl alcohol demonstrate higher ovicidal activity, reducing the need for repeat dosing.
- Safety – All listed options are approved for use on children six months or older, with rare reports of skin irritation. Dimethicone carries the lowest toxicity profile because it is inert and non‑systemic.
- Resistance – Repeated exposure to permethrin and pyrethrins has led to documented resistance in some regions; dimethicone and benzyl alcohol remain effective where resistance is prevalent.
Choosing the appropriate lice‑treatment shampoo depends on age, resistance patterns, and tolerance to potential skin reactions. The most widely recognized brand names are Nix, Rid, Licefreee, and Ulesfia, each corresponding to a distinct active ingredient and mode of action.