How long should a benzyl benzoate emulsion be left on for lice treatment? - briefly
The benzyl benzoate emulsion must stay on the scalp and hair for about 24 hours before washing off. A second application is recommended after 7–10 days if any live lice are still present.
How long should a benzyl benzoate emulsion be left on for lice treatment? - in detail
Benzyl benzoate emulsion is a pediculicidal preparation used to eradicate head‑lice infestations. The product must remain on the scalp and hair for a defined contact period to ensure lethal exposure of both lice and nits.
The recommended exposure time ranges from ten to fifteen minutes. Manufacturers and health‑authority guidelines specify that the emulsion should be left in place for at least ten minutes, with fifteen minutes providing a safety margin for resistant specimens. After the interval, the hair is rinsed thoroughly with warm water.
A second application is advised seven days after the first treatment. This interval corresponds to the hatching period of surviving eggs, preventing re‑infestation.
Key safety considerations include:
- Minimum age: six months; younger infants require medical supervision.
- Avoid contact with eyes, nasal mucosa, or broken skin.
- Do not apply to severely irritated or inflamed scalp; discontinue if severe burning occurs.
- Pregnant or lactating individuals should consult a health professional before use.
Typical procedure:
- Apply a generous amount of the emulsion to dry hair, ensuring complete coverage of the scalp and all hair shafts.
- Massage gently to distribute evenly.
- Allow the product to act for ten to fifteen minutes without washing or rinsing.
- Rinse hair thoroughly with warm water; shampoo may be used after rinsing if desired.
- Repeat the entire process after seven days.
Adherence to the specified contact time and repeat dosing maximizes efficacy while minimizing the risk of resistance and adverse reactions.