How long should dichlorvos be applied for lice? - briefly
Apply the product for about 10 minutes, then rinse thoroughly with water. If any nits remain, repeat the treatment after 7 days.
How long should dichlorvos be applied for lice? - in detail
Dichlorvos, a fast‑acting organophosphate, is typically applied as a topical spray or shampoo for head‑lice infestations. The product label and most regulatory agencies specify a single exposure lasting 10 minutes. After this period, the treated area must be rinsed thoroughly with water to remove residual chemical.
If the infestation persists, a second treatment is permitted after 7 days. This interval corresponds to the life cycle of lice: eggs hatch within 7–10 days, so a repeat application targets newly emerged nymphs that survived the first exposure. No further applications beyond the second treatment are recommended without medical supervision, as repeated exposure increases the risk of neurotoxic effects.
Safety considerations dictate strict adherence to the timing:
- Apply only to dry hair and scalp; avoid contact with eyes, mucous membranes, and broken skin.
- Use the exact amount specified on the label; excess volume does not shorten the required exposure time.
- After the 10‑minute contact period, wash hair with lukewarm water and a mild shampoo; do not use hot water, which may enhance skin absorption.
- Keep treated individuals, especially children, away from food, drink, and pets during application and rinsing.
Potential side effects—skin irritation, dizziness, headache—are more likely with prolonged contact or repeated use. Monitoring for these symptoms after each treatment is essential; seek medical attention if they appear.
In summary, the standard protocol consists of a 10‑minute exposure followed by a thorough rinse, with an optional repeat after one week if lice are still present. Deviating from this schedule offers no additional benefit and may compromise safety.