Acetic Acid Pyrethrins
Acetic Acid/Pyrethrins is a topical combination medication used primarily for treating parasitic infestations, particularly head lice and their eggs (nits). Acetic acid works by creating an acidic environment that helps loosen debris and may have mild antimicrobial properties, while pyrethrins act as natural insecticides that target the nervous system of insects. This medication is typically applied to the scalp or affected skin areas and is suitable for both adults and children.
A topical anti-parasitic medication combining an acid with natural insecticides for treating lice infestations.
Key facts at a glance
- RxNorm
- 1007445
- Generic
- Acetic Acid / Pyrethrins
- Class
- multi-ingredient
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Primarily used to treat head lice (pediculosis capitis) and pubic lice (pthiriasis). May also be used for certain ear conditions involving debris accumulation or mild infections when formulated as otic drops.
Pyrethrins are natural insecticides derived from chrysanthemum flowers that disrupt the nervous system of insects, causing paralysis and death. Acetic acid provides an acidic environment that helps loosen nits (eggs) from hair shafts and may support the antimicrobial action.
For external use only. Avoid contact with eyes, nose, and mouth. A second treatment is often needed 7-10 days after the first to kill newly hatched lice. Do not use if allergic to chrysanthemums, ragweed, or pyrethrins. Consult a healthcare provider before use on young children or if skin irritation occurs.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy