Are Head Lice Becoming Resistant to Medications?

Print this page Bookmark and Share

I've heard that head lice are often immune to the usual treatments. Is that true? And what can parents do to get rid of lice for good?
- Keith

Just like the overuse of antibiotics has helped create so-called "superbugs," the ongoing use of lice treatments over the years has made the pesky parasites resistant to some treatment medications. The more people use the remedies, the more the bugs start to build immunity to them.

Researchers have been saying for years that this was probably happening. Although growing drug resistance can make getting rid of the tiny insects a real pain, it's not cause for too much concern. That's because lice are not dangerous. Lice don't cause any health problems or spread any diseases (unlike other bugs, such as ticks) — they're just an incredibly annoying problem for both parents and kids.

And the fact that lice sometimes don't respond to some of the treatments (like medicated over-the-counter and prescription shampoos, cream rinses, or lotions) doesn't mean that they don't ever work. They do, but it make time some time, patience, and working with your doctor to find the right one that finally gets rid of the little buggers.

Also, lice may linger if kids are still exposed to other infested children or if the medication isn't used exactly as directed. For example, parents might overlook the fine print about what not to do when using the medicines — like avoiding using a cream rinse or shampoo-conditioner combination before applying lice medication and not washing a child's hair for 1 to 2 days after using a medicated treatment.

Lice infestations are often over-diagnosed, too. Some parents who think a child has lice might be wrong — the itching and white specks could be caused by other things, like dandruff or ringworm of the scalp.

Even if there's no doubt that lice are the cause of all the scratching, it's important to avoid going overboard with treatments. Lice medications are insecticides and can be harmful when applied too heavily or too often. That means you should never use more than one head lice medication at a time, extra amounts of the medicine, or the same medication more than three times.

Be sure to talk to your doctor before treating — or re-treating — your youngster for lice. If the insects are still around 2 weeks after you started treatment or your child's scalp looks infected, call your doctor, who may recommend trying a different product.

And, as you're in the lice-fighting trenches, try to remember that this too shall pass!

Reviewed by: Steven Dowshen, MD
Date reviewed: January 2012

Related Resources

OrganizationAmerican Academy of Pediatrics (AAP) The AAP is committed to the health and well-being of infants, adolescents, and young adults. The website offers news articles and tips on health for families.
Web SiteHeadLice.Org for Kids This site, run by the National Pediculosis Association, is designed to help kids understand lice. It has games, animation, and frequently asked questions about lice.

Related Articles

Head Lice Lice aren't dangerous and they don't spread disease, but they are contagious, annoying, and sometimes hard to get rid of. Learn more about this common childhood problem and how to get rid of those pesky little bugs.

Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.

© 1995-2014 KidsHealth® All rights reserved.
Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and


Upcoming Events

The Boonshoft School of Medicine is hosting the first Annual: In it for the Long Run BSOM Dayton Children’s Hem/Onc 5k and Kids' 1 mile run on April 9th. What better way to jump start your spring by running a 5k in support of this amazing hospital that helps so many local children and their family?

Free special education seminar for parents and professionals on the transition from childhood to adulthood. Learn skills to help your disabled child understand the physical, emotional and social changes of puberty, sexuality and safety.

View full event calendarView more events...

Health and Safety

Your child's health and safety is our top priority


The Children's Medical Center of Dayton Dayton Children's
The Right Care for the Right Reasons

One Children's Plaza - Dayton, Ohio - 45404-1815