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February 10, 2012

Pinworm Infection (cont.)

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What are the symptoms of pinworms?

Intense itching around the anus and/or vagina are the classic symptoms of pinworms. Less common symptoms range from upset stomach to loss of appetite, irritability, restlessness, and insomnia.

The symptoms of pinworm infection are caused by the female pinworm laying her eggs. Most infected individuals have few or no symptoms but, if the infection is heavy, the symptoms can be correspondingly more severe.

How is pinworm infection diagnosed?

If pinworms are suspected, transparent adhesive tape or a pinworm paddle (supplied by your healthcare practitioner) are applied to the anal region. The eggs (and sometimes the parasites themselves) adhere to the sticky tape or paddle and are identified by examination under a microscope. The test is sometimes referred to as "the Scotch Tape test."

The test should be done as soon the affected individual wakes up in the morning (because bathing or having a bowel movement may remove most eggs and parasites). The exam may require several samples for diagnosis. Samples taken from under the fingernails may also contain eggs (since scratching of the anal area is common by affected individuals).

At night, the adult worms can sometimes be seen directly in bedclothes or around the anal area: this is another good time to detect the parasites with the transparent adhesive tape method.

What is the treatment of pinworms; is there a home treatment?

Pinworm medications

  • Usually a single tablet of mebendazole (Vermox) is used for treatment. This can sometimes be repeated a week later or, if infection persists, the medication is given again three weeks later. Some clinicians recommend a treatment protocol of a drug dose every 3 weeks, 3 times, so that the person has effective drug treatment for about 9 weeks total.

  • Another effective medication is albendazole (Albenza) but it may require other medications to reduce the inflammation of the central nervous system, a side effect of the drug.

  • Pyrantel pamoate (Pin-Rid, Pin-X) is available over-the-counter for pinworm after confirmation of the diagnosis by a licensed healthcare practitioner. Drugs available over-the-counter vary from country to country.

  • To treat pinworms affecting urinary and genital organs, combination therapy with oral mebendazole (Vermox) and ivermectin (Stromectol) for the worms as well as topical therapy for the eggs may be required.

Most pinworm infections are treated at home with the above medications. However, reinfection is fairly common. To both reduce the chances for reinfection and to help prevent others from getting pinworms, see the prevention section.


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