How many times should you treat lice? - briefly
A standard regimen calls for two applications, the second 7–10 days after the first to eliminate newly hatched nits. If live lice persist after the second round, a third treatment may be necessary.
How many times should you treat lice? - in detail
The life cycle of head‑lice requires at least two applications of a pediculicide to eradicate an infestation. The first dose kills live insects on the scalp and hair shafts. Eggs (nits) are resistant to most chemicals; they hatch within 7–10 days. A second application, scheduled 9–10 days after the initial treatment, targets newly emerged nymphs before they mature and reproduce.
If a thorough inspection after the second round still reveals live lice, a third treatment may be necessary. This additional dose should be administered another 7–10 days later, but only after confirming that the previous applications were performed correctly and that resistance to the chosen product has not developed.
Key points for an effective regimen:
- Apply the first treatment according to label instructions; ensure complete coverage of hair and scalp.
- Wait 9–10 days, then repeat the same procedure.
- Conduct a detailed combing session after each treatment to remove dead insects and nits.
- Perform a final inspection 2–3 days after the last application; if live lice remain, consider a third round.
- For resistant infestations, consult a healthcare professional for prescription‑strength options or alternative methods such as silicone‑based lotions.
Following this schedule aligns with the biological timeline of the parasite and maximizes the likelihood of complete eradication.