Important: This page is general information, not medical advice. It does not recommend or prescribe any treatment. Always consult your doctor or pharmacist before starting, stopping or changing any medicine.
Note on this source. The FDA label used for this page covers a combination product listed as Piperonyl Butoxide, Pyrethrum Extract. The information below therefore describes that product, not Pyrethrum Extract on its own. Check the label of the specific product you have.
Quick facts
- How it is given
- topical
- Type
- human otc drug
- Brand names
- Herklin Lice Treatment
- RxNorm ID
- 283219
We do not publish dosing. How much of this medicine to take, how often, and for how long depends on your age, weight, kidney and liver function, other conditions and other medicines. That is a decision for the person who prescribes or dispenses it. Follow the directions on your own pack and ask your pharmacist if anything is unclear.
What it is for
Purpose Treatment head, pubic (crab), and body lice
What it is used to treat
Uses Uses treats head lice, pubic (crab) lice, and body lice
Do not use if
For external use only. Do not use near eyes inside nose, mouth or vagina on lice in eyebrows or eyelashes. See a doctor if lice are present in these areas.
Warnings
Warnings For external use only. Do not use near eyes inside nose, mouth or vagina on lice in eyebrows or eyelashes. See a doctor if lice are present in these areas. Ask a doctor before us if you are allergic to ragweed, May cause breathing difficulty or an asthmatic attack. When using this product keep eyes tightly closed and protect eyes with a washcloth or towel if product gets in eyes, flush with water right away scalp itching or redness may occur. Stop use and ask doctor if breathing difficulty occurs eye irrirtation occurs skin or scalp irritation continues or infection occurs Keep out of reach of children If swallowed, get medical help or contact a Poison Control Center right away.
Ask a doctor before use if
Ask a doctor before us if you are allergic to ragweed, May cause breathing difficulty or an asthmatic attack.
When using this medicine
When using this product keep eyes tightly closed and protect eyes with a washcloth or towel if product gets in eyes, flush with water right away scalp itching or redness may occur.
Stop use and see a doctor if
Stop use and ask doctor if breathing difficulty occurs eye irrirtation occurs skin or scalp irritation continues or infection occurs
Storing it safely
Other Information do not freeze store at controlled room temperature, 20 °C to 25 ° C (68 ºF to 77 ºF) Questions or comments call (844) 437-5546 see package insert for additional information
Keeping it away from children
Keep out of reach of children If swallowed, get medical help or contact a Poison Control Center right away.
Active ingredient
Drug Facts Active Ingredients Piperonyl butoxide 4%.........................................................................Lice Treatment Pyrethrum extract (equivalent to 0.33 % pyrethrins.................................Lice Treatment
Other ingredients
Inactive Ingredients ammonium laureth sulfate, fragrance, PEG-25 hydrogenated castor oil, polyquaternium-10, purified water, SD-40 alcohol
Before you take anything new
Tell your pharmacist or doctor about every medicine you take — including ones bought without a prescription, herbal products and supplements. Interactions are one of the most common avoidable causes of harm from medicines, and a pharmacist can check your full list in a couple of minutes.
This page is built from the openFDA record of the U.S. Food and Drug Administration's approved labelling for this product, effective 16 July 2018. Label text has been shortened and reformatted for readability; safety wording has not been altered in meaning. FDA labelling describes products approved in the United States — brand names, strengths, formulations and approved uses may differ in your country. Always read the leaflet that comes with your own pack. PocketsInfo is not affiliated with, and is not endorsed by, the FDA. Retrieved 2026-07-30.