How can you treat the head for lice with dichlorvos? - briefly
Apply a dichlorvos‑containing shampoo or spray to fully coat the hair and scalp, leave it on for the time specified by the manufacturer, then rinse thoroughly; repeat the application after 7–10 days to eradicate any newly emerged lice.
How can you treat the head for lice with dichlorvos? - in detail
Dichlorvos, an organophosphate insecticide, is sometimes employed as a contact treatment for head‑lice infestations. The compound works by inhibiting acetylcholinesterase, causing paralysis and death of the parasite upon direct exposure.
Preparation and safety
- Obtain a formulation specifically labeled for human use; products intended for agricultural or veterinary purposes are unsuitable.
- Verify the expiration date and inspect the container for damage.
- Wear disposable gloves and ensure adequate ventilation; dichlorvos vapors are irritating to the respiratory tract.
- Keep the product away from children, pets, and food preparation areas.
Application procedure
- Separate hair into sections of approximately 2 cm width using a fine‑toothed comb.
- Apply the liquid directly to the scalp and hair, saturating each section for a minimum of 10 minutes.
- Maintain the wet state for the duration specified by the manufacturer, typically 30 minutes, to allow sufficient insecticidal activity.
- Rinse thoroughly with lukewarm water; avoid hot water, which may increase dermal absorption.
- Comb the hair with a fine lice comb while still damp to remove dead nits and lice.
- Repeat the entire process after 7–10 days to eliminate any newly hatched insects.
Post‑treatment measures
- Wash bedding, clothing, and personal items in hot water (≥ 60 °C) or seal them in plastic bags for two weeks.
- Inspect the scalp daily for residual lice; perform a second combing session if live insects are observed.
- Document any adverse reactions such as skin irritation, headache, or nausea; discontinue use and seek medical advice if symptoms persist.
Regulatory considerations
Many health agencies have restricted or banned dichlorvos for over‑the‑counter lice control due to its toxicity profile. Verify local regulations before purchase, and prioritize products that have received explicit approval for human head‑lice treatment.
Alternatives
If dichlorvos is unavailable or contraindicated, consider permethrin‑based lotions, ivermectin oral therapy, or mechanical removal with a nit comb, all of which carry lower systemic risk.
In summary, effective use of dichlorvos requires a labeled human formulation, strict adherence to dosage and exposure times, comprehensive safety precautions, and a follow‑up treatment cycle to ensure complete eradication.