Frequently Asked Questions

Pinworms are very small, pin-shaped worms that can live in the human colon and/or rectum. Pinworm is an intestinal infection caused by a tiny, white, highly contagious intestinal worm (Enterobius Vermicularis) that looks like a thread and measures about 1/2″ (1 cm) in length. Since they are very small, a person will not necessarily see them until the infestation is large.

Most people get infected by ingesting microscopic pinworm eggs, which travel through the stomach to the intestines, where they hatch. After 2–4 weeks, adult female pinworms migrate to the rectal area and lay eggs, causing itching. Scratching transfers eggs to fingers, which can spread them. Retro‑infection can occur when another person ingests these eggs and the cycle repeats.

Pinworm infection occurs worldwide across all ages and socioeconomic levels, and it's the most common worm infection in the U.S. Most commonly impacted are school‑aged and preschool‑aged children, institutionalized individuals, and household members or caretakers of infected persons. Child care centers are often sites of multiple cases.

Suspect infection if someone is frequently scratching their anal area, uncomfortable sitting, having difficulty sleeping, acting restless, or has a loss of appetite.

Confirm by consulting a healthcare professional or performing the “Scotch® Tape Test” - apply tape to the skin around the anus to look for eggs or worms. The test should be done mid‑night or first thing in the morning before bathing or using the toilet.

Reese’s Pinworm Medicine is administered in one dose after pinworm infection has been confirmed. Dosage is based on the individuals’ weight. Specific dosage instructions can be found within your Reese’s Pinworm Medicine box.

The banana flavor is a natural flavor. Avoid it if you or your child is allergic to bananas.

The product does not contain gluten or dairy, but it is not explicitly labeled gluten‑free or dairy‑free. Individuals with dietary sensitivities should review the ingredient list.

The medicine is available online and at retailers nationwide including Walmart and Rite Aid. Use our store locator to find a nearby location.

Do not repeat treatment unless directed by a doctor. Pinworm eggs may remain in the home, so consult your doctor about further steps. Prevention tips include bathing or showering daily, frequently washing underwear, sleepwear, toys, and bedding, washing hands regularly (especially after toilet use and before eating), trimming fingernails short, discouraging nail‑biting and scratching, and keeping the home clean.

Pinworm infection is fully treatable, best with an over‑the‑counter pyrantel pamoate-based medicine such as Reese’s Pinworm Medicine, which is highly effective - usually with just one dose. All family members should be treated simultaneously. For large households, a larger or Family Pack may be needed. The medicine generally clears the infection in about 72 hours. After treatment, clean bedroom floors by vacuuming or damp mopping, wash bed linens and nightwear (without shaking), and keep toilets clean.

Yes. Treating all household members at the same time—even those without symptoms—is proactive and helps prevent reinfection. 

Side effects are rare but may include mild stomach discomfort, nausea, or diarrhea. Seek medical advice if severe side effects occur.

Consult a healthcare professional before using any medication during pregnancy or breastfeeding. They will give guidance based on individual circumstances.

Reese’s Pinworm Medicine generally takes 48 to 72 hours to take effect.

No. Consult your veterinarian before giving any medication to your pet.