How do you treat lice with alcohol? - briefly
Apply 70 % isopropyl alcohol directly to the scalp and hair, saturating the area and allowing it to dry before using a fine-toothed comb to remove nits. Repeat the treatment after 24 hours to eliminate any newly hatched lice.
How do you treat lice with alcohol? - in detail
Alcohol can be employed as a contact agent against head‑lice infestations, but its use requires precise preparation and strict safety measures.
First, select a high‑purity ethanol or isopropyl solution (minimum 70 % concentration). Lower concentrations lack sufficient lytic activity, while higher concentrations increase the risk of skin irritation and systemic absorption.
Apply the liquid directly to the hair and scalp using a spray bottle or a cotton applicator. Ensure thorough saturation of the entire infested area, including the roots and the nape of the neck. Allow the alcohol to remain in contact for 5–10 minutes; this duration maximizes protein denaturation in the lice exoskeleton and disrupts their nervous system.
After the exposure period, rinse the hair with lukewarm water and a mild, non‑oil‑based shampoo to remove residual solvent. Repeat the procedure after 7–10 days to eliminate any newly hatched nymphs that survived the initial treatment.
Safety considerations:
- Perform a patch test on a small skin area 24 hours before full application to detect hypersensitivity.
- Avoid use on children under 2 years, pregnant or lactating individuals, and persons with open wounds or dermatitis.
- Do not apply near the eyes, mucous membranes, or broken skin; accidental contact can cause severe irritation or chemical burns.
- Ensure adequate ventilation to prevent inhalation of vapors, which can cause dizziness or respiratory discomfort.
Limitations:
- Alcohol does not provide residual protection; re‑infestation can occur if environmental sources (bedding, clothing) are not concurrently treated.
- The chemical does not penetrate the egg (nits) wall effectively; mechanical removal of nits with a fine-tooth comb remains essential.
- Repeated use can dry the scalp, leading to flaking or dermatitis.
For comprehensive management, combine alcohol treatment with thorough combing, washing of personal items in hot water (≥ 60 °C), and, when necessary, approved pediculicidal medications.