Threadworms are small, white thread-like worms that live in your digestive tract and can be seen in your stool (poo). They are harmless, but they frequently cause itchiness and irritation around the anus, particularly at night.
Ovex Mebendazole 4 Pack
Ovex mebendazole tablets work by stopping the worms from absorbing the sugars they need to survive in the digestive tract, without these sugars the threadworms will die. A single dose of mebendazole will kill threadworms, however some of the eggs may survive and a second dose may be required after 2 weeks to prevent reinfection. This comes in a pack of 4 suitable for the whole family.
This is suitable for adults and children over the age of 2.
How to Apply Ovex Mebendazole?
This treatment is a single tablet per person. Adults and children over 2 years old can take one tablet only. The tablets are orange flavored and may be chewed or swallowed whole. Crush tablets before giving to young children. This tablet is not recommended for children under 2 years of age. After taking the tablet, please make sure to take a shower to get rid of the worm eggs including thoroughly cleaning under your nails and changing bed sheets and clothing if possible to help minimize the likelihood of reinfection.
Precautions
Do not use this if any of the following apply to you:
If you are taking the medicine Metronidazole
If you are taking the medicine Cimetidine
If you have noticed bleeding during your bowel movement
If you have diarrhea
Make sure to consult your doctor for advice before taking any medicine.
Warning
A single dose of this medicine will kill threadworms. However, it may not destroy their eggs, which can cause reinfection and also infect other people. It is therefore strongly recommended that all members of the family (except pregnant or breastfeeding women and children under two) are treated at the same time and that precautions are taken to prevent re-infection.
In case of re-infection, a second dose can be taken after two weeks.
Seek advice before using if you are breastfeeding, pregnant, planning to become pregnant, or suffer from allergies.
Side Effects of Taking Mebendazole include:
Stomach pain
bloating/ wind
Diarrhea
Blisters on the skin mouth eyes and genitals
Yellow skin or the whites of your eyes turn yellow
If you experience any side effects please consult with your doctor for the best advice regarding your treatment.please note the last two side] effects are particularly dangerous and should not be ignored.
Our Clinical Authors
This page has been written by a registered UK pharmacist and reviewed by our clinical team to ensure it is accurate, clear and reflects current clinical guidance.
Last medically reviewed: 26 February 2026
Last updated: 26 February 2026