How long are lice treated? - briefly
Lice treatment usually lasts about seven days, with a second application recommended after 7‑10 days to eliminate any newly hatched insects. This schedule ensures complete eradication of the infestation.
How long are lice treated? - in detail
Lice infestations are eliminated through a series of applications rather than a single event. The typical protocol for over‑the‑counter insecticides involves an initial treatment followed by a repeat dose after a period that allows newly hatched nymphs to emerge from eggs. The interval commonly recommended ranges from seven to ten days; this timing aligns with the average hatching period of pediculus capitis eggs.
Prescription‑strength products may follow a different schedule. Oral ivermectin is often administered as a single dose, with a second dose considered after fourteen days for resistant cases. Spinosad formulations usually require an initial application and a follow‑up treatment after nine days. Both regimens aim to cover the full life cycle of the parasite.
Mechanical removal techniques rely on sustained effort. Wet combing with a fine‑toothed nit comb should be performed daily for at least fourteen days, ensuring that any surviving eggs are manually extracted. The process continues until no live lice are observed in successive examinations.
Several variables affect the overall treatment period:
- Resistance patterns in the local lice population
- Extent of the infestation (number of nits and live insects)
- Adherence to the prescribed interval between applications
- Use of adjunctive measures such as laundering of bedding and personal items
When these factors are addressed systematically, the eradication timeline typically falls within the following framework:
- Initial chemical or mechanical intervention – day 0
- First repeat application – day 7 to 10 (or day 14 for oral ivermectin)
- Final verification combing or inspection – day 14 to 21
Successful resolution is confirmed when successive checks reveal no live lice or viable eggs.