HomeAnswersGeneral Medicinepinworm infectionMy pinworm infection symptoms are not improving after Mebendazole. Why?

Why is there recurrent pinworm infection even after two doses of Mebendazole?

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The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Answered by

Dr. Y. Siva Roja

Medically reviewed by

Dr. Vinodhini J.

Published At January 14, 2020
Reviewed AtNovember 2, 2022

Patient's Query

Hello doctor,

I am struggling with pinworm infection. I took one dose of Mebendazole (100 mg) and it helped. Two weeks later, I took the recommended second dose and about three days after I started exhibiting symptoms again. It is now a week after taking the second dose, symptoms are not improving.

Answered by Dr. Y. Siva Roja

Hello,

Welcome to icliniq.com.

I have gone through your problem. Reinfection with pinworm is quite frequent. Mebendazole two doses are the standard way of treatment. But in your case, reinfection may have occurred because of remnant eggs.

1) Please change your sheets on the bed and wash them thoroughly.

2) Thoroughly wash the undergarments as they are the major source of remnant eggs of pinworm.

3) Wash your hands properly.

4) Avoid scratching in the anal region which you may be doing because of itching.

5) If there is a school going kid at your home, please do inform the class teacher regarding this as other untreated kids may be another source.

Another major thing to consider is whether you are definitely having pinworm infection or not? In pinworm infection usually, the eggs which are laid in the perinatal region and worms are not commonly released in stools. The presence of eggs can be diagnosed with a simple tape test at your physician's office.

If this is due to any other worm infection, the required dose of Mebendazole is different and what is taken by you will not be sufficient. I suggest you get this clarified because what requires is a simple tape test and a stool examination for other ova or cysts.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Y. Siva Roja
Dr. Y. Siva Roja

Internal Medicine

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