About permethrin
Topical pyrethroid antiparasitic
Used for
- Treats head lice and their eggs.
Usual adult dose
Apply to damp hair and scalp, leave for 10 minutes, then rinse; repeat after 7–10 days if needed.
Usual dose in children
For children aged 2 months and older: apply to damp hair and scalp, leave for 10 minutes, then rinse; repeat after 7–10 days if needed.
Common side effects
- Scalp itching or tingling
- Redness or irritation
- Rash
Important warnings
- For external use only; avoid eyes, nose, and mouth.
- Do not use in infants younger than 2 months.
- Treat household contacts with lice and wash recently used bedding and clothing.
- Follow the product label; formulations may have different instructions.
Pregnancy
Generally considered low risk because very little is absorbed through the skin; human pregnancy data are limited.
Breastfeeding
Low absorption makes exposure through breast milk unlikely; avoid applying to the breast or nipple.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.