Pinworms

What Are Pinworms?

• Pinworms (Enterobius vermicularis) are small, thin, white worms that live in the colon and rectum.

• They cause itching around the anus, especially at night, when the worms lay eggs.

• They spread easily through contact with contaminated hands, bedding, or surfaces.

First-Line Treatments

Treatment is straightforward and usually very effective. All household members are typically treated at the same time to prevent reinfection.

Common Medications (all given as a single oral dose, then repeated in 2 weeks)

• Mebendazole, Albendazole, Ivermectin are prescription

• Pyrantel pamoate (Reese’s Pinworm Medicine, OTC): repeat in 2 weeks.

  • Safe for children ≥2 years old.

  • Available without a prescription.

Hygiene Measures (to prevent reinfection)

• Handwashing: especially after using the toilet and before eating.

• Trim fingernails short: discourages scratching/egg spread.

• Daily morning bathing: helps remove eggs laid overnight.

• Frequent laundry: wash underwear, bedding, and pajamas in hot water.

• Avoid shaking out sheets or clothes: eggs can become airborne and inhaled.

•  When to Call the Doctor

• If symptoms persist after treatment.

• If your child is <2 years old (special dosing may be needed).

• If there’s significant abdominal pain, weight loss, or concerns about other infections.