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Ovex Threadworms Treatment Tablet - 1

Ovex Threadworms Treatment Tablet - 1

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  • ✔️ Kills threadworms with a single 100mg mebendazole tablet
  • ✔️ Suitable for adults and children aged two years and over
  • ✔️ Chewable tablet for easy administration to children
  • ✔️ Second dose option available if reinfection occurs
  • ✔️ Treats the whole household with one pack per person

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What Is Ovex Threadworm Treatment Tablet?

 

Threadworms are one of the most common parasitic infections in the UK, particularly in school-age children — but they can affect anyone. If you or someone in your household has been experiencing intense itching around the bottom, especially at night, there is a good chance threadworms are the cause. The good news? A single tablet is often all it takes. Threadworm treatment with Ovex is straightforward, effective, and available without a prescription from Cured Pharmacy for just £4.48.

Ovex Threadworm Treatment Tablet contains mebendazole 100mg as its active ingredient. It is licensed in the UK as an over-the-counter (OTC) medicine for the treatment of threadworm infections (Enterobius vermicularis) in adults and children aged 2 years and over. The NHS recommends treating all members of the household at the same time, even if not everyone has symptoms, to reduce the risk of reinfection. If you are also dealing with other digestive discomfort, you might find our IBS and Cramps range useful alongside your treatment plan.

 

How Does Ovex Threadworm Treatment Tablet Work?

 

Mebendazole, the active ingredient in Ovex, belongs to a class of medicines called anthelmintics — drugs that act against parasitic worms. It works locally within the gut rather than being significantly absorbed into the bloodstream, which is one reason it is considered well-tolerated for most people.

  • Mebendazole selectively binds to tubulin, a structural protein in the threadworm's cells.
  • This disrupts the worm's ability to form microtubules — structures essential for glucose uptake.
  • Without glucose, the worms are starved of energy and die within a few days of treatment.
  • Dead worms are then passed naturally through the bowel.

It is worth noting that Ovex kills the worms but does not destroy their eggs. This is why hygiene measures — thorough handwashing, cutting fingernails short, and washing bedding and nightwear — are just as important as taking the tablet itself.

 

Who Should Use Ovex Threadworm Treatment Tablet?

 

Ovex is suitable for a wide range of patients. It is designed for anyone who has confirmed or suspected threadworm infection and meets the eligibility criteria below. Because threadworms spread so easily within households, the NHS advises treating the whole family simultaneously.

  • Adults aged 18 and over with a threadworm infection
  • Children aged 2 years and over (with parental supervision)
  • Household contacts of an infected person, even without symptoms
  • Those who have had a previous threadworm infection and wish to treat a recurrence

Ovex is not suitable for children under 2 years of age, pregnant women (especially in the first trimester), or those with a known hypersensitivity to mebendazole or any other ingredient in the tablet.

 

How Does Ovex Compare to Other Threadworm Treatments?

 

Feature Ovex (Mebendazole 100mg) Pripsen (Piperazine)
Active ingredient Mebendazole Piperazine phosphate
Suitable age 2 years and over 3 months and over
Dosage form Single chewable tablet Powder sachets mixed with liquid
Suitable in pregnancy Not recommended Not recommended

 

How Should You Store Ovex and Is It Suitable for Everyone?

 

Store Ovex below 25°C in a dry place, away from direct sunlight and out of the reach and sight of children. Do not use the tablet after the expiry date printed on the packaging. If you are unsure whether this threadworm treatment is right for you — for example, if you have liver disease or are taking other medicines — speak to your pharmacist before use. You can also browse our Baby and Toddler range if you are looking for additional products to support your child's health alongside treatment.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Ovex Threadworms Treatment Tablet - 1 specifications
Treatment category Anthelmintic / Threadworm treatment
Active ingredient Mebendazole 100mg
Mechanism of action Inhibits glucose uptake in threadworms by binding to tubulin
Effective against Enterobius vermicularis (threadworms)
Suitable for Adults and children aged 2 years and over
Pack size 1 tablet
Strength 100mg
UK classification Pharmacy (P) medicine
Drug class Anthelmintic (benzimidazole)
Preparation Tablet (chewable or swallowable)
Route of administration Oral

Specifications of Ovex Threadworms Treatment Tablet - 1

 

What Is Ovex Threadworms Treatment Tablet and What Is It Used For?

 

Ovex Threadworms Treatment Tablet is an OTC anthelmintic medicine containing mebendazole 100mg. It is used to treat infections caused by threadworms (also called pinworms), which are tiny white worms that can live in the intestines and around the back passage. Threadworm infections are very common in the UK, particularly among children aged 5 to 10, though adults are equally susceptible. The NHS confirms that threadworms are the most common type of worm infection in the UK.

 

What Do You Need to Know Before Using Ovex Threadworms Treatment Tablet?

 

Before taking Ovex, it is important to check that it is appropriate for you. Do not take this medicine if any of the following apply:

  • You are under 2 years of age
  • You are pregnant or trying to become pregnant — mebendazole is not recommended, especially in the first trimester
  • You are breastfeeding (seek medical advice first)
  • You have a known allergy to mebendazole or any other ingredient in the tablet
  • You have severe liver disease

The following medicines may interact with mebendazole. Tell your pharmacist if you are taking:

  • Metronidazole — may increase the risk of skin reactions when combined with mebendazole
  • Cimetidine — may increase mebendazole blood levels
  • Medicines for epilepsy such as carbamazepine or phenytoin — may reduce the effectiveness of mebendazole

 

How Should You Use Ovex Threadworms Treatment Tablet?

 

Using Ovex correctly gives you the best chance of clearing the infection. Follow these steps carefully:

  1. Take one Ovex 100mg tablet as a single dose.
  2. The tablet can be chewed, swallowed whole, or crushed — whichever you find easiest.
  3. Treat all members of the household at the same time, even if they have no symptoms.
  4. If reinfection occurs or symptoms persist after two weeks, a second dose may be taken.
  5. Continue strict hygiene measures for at least six weeks alongside treatment.
Patient Group Age Dose Frequency
Adults 18 years and over 1 tablet (100mg) Single dose; repeat after 2 weeks if needed
Children 2–17 years 1 tablet (100mg) Single dose; repeat after 2 weeks if needed
Children under 2 Under 2 years Not recommended Seek medical advice

 

What Are the Possible Side Effects of Ovex Threadworms Treatment Tablet?

 

Most people tolerate Ovex well. Because mebendazole is poorly absorbed from the gut, systemic side effects are uncommon. However, as with all medicines, some people may experience unwanted effects.

Common side effects (may affect up to 1 in 10 people):

  • Abdominal pain or stomach cramps
  • Diarrhoea
  • Flatulence (wind)

Less common side effects (may affect up to 1 in 100 people):

  • Nausea or vomiting
  • Dizziness
  • Skin rash or itching
  • Raised liver enzymes (with prolonged use at higher doses — not relevant at the standard single OTC dose)

Stop taking Ovex and seek immediate medical attention if you develop signs of a serious allergic reaction, such as swelling of the face, lips, or throat, difficulty breathing, or a severe skin rash. If you are also managing other gut-related symptoms, our Diarrhoea range may offer additional support during your recovery.

 

How Should You Store Ovex Threadworms Treatment Tablet?

 

  • Store below 25°C in a dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the reach and sight of children
  • Do not use after the expiry date printed on the packaging
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacist

If you have any further questions about storing or using this medicine, your pharmacist at Cured Pharmacy is always happy to help. You might also find it helpful to explore our First Aid range for other household health essentials.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Ovex Threadworm Treatment Tablet online in the UK?

You can buy Ovex Threadworm Treatment Tablet online from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.48. It is available without a prescription for adults and children aged 2 years and over. Simply add it to your basket and it will be dispatched quickly and discreetly to your door.

How does Ovex work in the body to kill threadworms?

Ovex contains mebendazole, which works by binding to a protein called tubulin inside the threadworm's cells. This prevents the worms from absorbing glucose, effectively starving them of energy until they die. The dead worms are then passed naturally through your bowel over the following days.

How do I use Ovex Threadworm Treatment Tablet step by step?

Take one Ovex 100mg tablet as a single dose — you can chew it, swallow it whole, or crush it, whichever is easiest. All members of your household should take a tablet at the same time, even if they have no symptoms. If symptoms return after two weeks, a second dose can be taken.

What is the correct dose of Ovex for adults and children?

The dose is one 100mg tablet for both adults and children aged 2 years and over. Children under 2 years of age should not take Ovex without specific medical advice from a GP. There is no dose adjustment needed based on body weight for the standard threadworm indication.

When is the best time to take Ovex Threadworm Treatment Tablet?

Ovex can be taken at any time of day, with or without food — there is no specific timing requirement. Many people find it convenient to take it in the morning alongside other household members to ensure everyone is treated simultaneously. Consistency with hygiene measures throughout the day is more important than the exact time of dosing.

What are the side effects of Ovex and how do I manage them?

Side effects from Ovex are uncommon because mebendazole is poorly absorbed from the gut. The most likely effects are mild abdominal pain, diarrhoea, or flatulence, which usually resolve on their own. If you experience a severe allergic reaction — such as facial swelling or difficulty breathing — stop taking the tablet and seek emergency medical help immediately.

Can I take Ovex if I am pregnant or breastfeeding?

Ovex is not recommended during pregnancy, particularly during the first trimester, as the safety of mebendazole in early pregnancy has not been fully established. If you are breastfeeding, speak to your GP or pharmacist before taking this medicine. Your doctor can advise on the safest approach for managing a threadworm infection during pregnancy.

Is Ovex suitable for children under 2 years old?

No — Ovex is not recommended for children under 2 years of age. If your child is younger than 2 and you suspect a threadworm infection, you should consult your GP for appropriate advice and treatment options. For other products suitable for young children, you can browse our Baby and Toddler range.

What happens if threadworms come back after taking Ovex?

If your symptoms return or persist after two weeks, you can take a second dose of Ovex. Reinfection is common because mebendazole kills the worms but not their eggs, which can survive on surfaces and under fingernails. Strict hygiene measures — including thorough handwashing, cutting nails short, and washing bedding at 60°C — are essential to break the cycle.

Do I need to treat the whole family if one person has threadworms?

Yes — the NHS recommends treating all members of the household at the same time, even if they have no symptoms. Threadworms spread very easily through contact with contaminated surfaces, bedding, and food, so treating only the affected person is unlikely to prevent reinfection. Everyone aged 2 and over in the household should take one Ovex tablet simultaneously.

What are alternatives to Ovex for threadworm treatment in the UK?

Pripsen, which contains piperazine, is the main OTC alternative to Ovex for threadworm treatment in the UK and is available as a powder sachet. It may be suitable for some patients who cannot take mebendazole, including younger children from 3 months of age. Speak to a pharmacist to find out which option is most appropriate for your situation.

Can Ovex interact with other medicines I am taking?

Yes, some medicines can interact with mebendazole. Metronidazole may increase the risk of a skin reaction called Stevens-Johnson syndrome when taken alongside mebendazole, and cimetidine may raise mebendazole levels in the blood. Epilepsy medicines such as carbamazepine or phenytoin may reduce how well mebendazole works, so always tell your pharmacist about any medicines you are currently taking.

How long does it take for Ovex to work?

Ovex begins working as soon as it reaches the gut, but it typically takes a few days for the threadworms to die and be passed out of the body. Itching around the bottom may continue for a short time after treatment as the body clears the dead worms. If symptoms have not improved within two weeks, a second dose can be taken.

What hygiene measures should I follow alongside taking Ovex?

Hygiene is just as important as the tablet itself, because Ovex does not kill threadworm eggs. You should wash hands and scrub under fingernails thoroughly after using the toilet and before eating, wash all bedding and nightwear at 60°C on the day of treatment, and vacuum and damp-dust surfaces regularly. These measures should be continued for at least six weeks to prevent reinfection. If you are also managing related digestive symptoms, our IBS and Cramps range may offer additional comfort.

What is the latest guidance on threadworm treatment in the UK?

Current NHS guidance confirms that mebendazole — the active ingredient in Ovex — remains the first-line OTC treatment for threadworm infections in adults and children aged 2 and over. The NHS advises combining medication with strict hygiene measures for at least six weeks to fully clear an infection. There have been no significant changes to this guidance in recent years, and mebendazole continues to be considered safe and effective for this indication.

How Should You Use Ovex Threadworms Treatment Tablet?

Using Ovex correctly is simple, but following each step carefully will give you the best chance of clearing the infection completely. The tablet can be taken at any time of day, with or without food, making it easy to fit into your routine.

Remember, the tablet kills the worms but not their eggs. Hygiene measures must continue for at least six weeks alongside any medication to fully break the cycle of infection.

What Is the Correct Dose of Ovex Threadworms Treatment Tablet?

The dosing for Ovex is straightforward — there is no weight-based calculation required for the standard threadworm indication. The table below summarises the recommended doses by age group.

Do not take more than the recommended dose. If you are unsure whether a second dose is appropriate, speak to your pharmacist before repeating treatment.

When Is the Best Time to Use Ovex Threadworms Treatment Tablet?

There is no specific time of day that is clinically required for taking Ovex — it can be taken morning, afternoon, or evening. However, many people find it practical to take it first thing in the morning so that all household members can be treated together at the same time, which is what the NHS recommends. Taking it alongside a meal may help if you have a sensitive stomach, though food is not required for the medicine to work.

How Long Can You Use Ovex Threadworms Treatment Tablet For?

Ovex is intended for short-term use only. A single tablet is the standard course of treatment, with a second dose available after two weeks if symptoms persist or reinfection occurs. It is not intended for long-term or repeated use beyond this without medical supervision. If you find yourself needing to treat threadworms frequently, speak to your GP, as this may indicate an ongoing source of reinfection that needs to be identified and addressed.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Ovex Threadworms Treatment Tablet?

Most people who take Ovex experience no side effects at all. Because mebendazole works locally within the gut and is poorly absorbed into the bloodstream, systemic effects are uncommon at the standard single OTC dose. That said, some people may notice mild gastrointestinal symptoms, particularly if the worm burden in the gut is heavy.

  • Abdominal pain or stomach cramps
  • Diarrhoea
  • Flatulence (wind)

What Are the Less Common Side Effects of Ovex Threadworms Treatment Tablet?

Less commonly, a small number of people may experience the following effects. These are generally mild and tend to resolve without any specific treatment once the course is complete.

  • Nausea or vomiting
  • Dizziness or headache
  • Skin rash or itching (urticaria)
  • Raised liver enzymes — this is more relevant at higher doses used for other worm infections and is not typically a concern at the standard single OTC dose for threadworms

What Are the Serious Side Effects of Ovex Threadworms Treatment Tablet?

Serious side effects from a single dose of Ovex are rare but can occur. The most significant concern is a severe allergic reaction (anaphylaxis), which, though uncommon, requires immediate medical attention. There have also been rare reports of Stevens-Johnson syndrome — a serious skin condition — particularly when mebendazole is taken alongside metronidazole. If you are taking metronidazole, do not take Ovex without speaking to a pharmacist or GP first.

  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Severe skin blistering or peeling
  • Rapid heartbeat or feeling faint

What Should You Do If You Experience Side Effects of Ovex?

If you experience mild side effects such as stomach cramps or loose stools, these will usually settle on their own within a day or two. Staying well hydrated and resting can help. However, if you develop any signs of a serious allergic reaction or severe skin reaction, stop taking the medicine immediately and call 999 or go to your nearest A&E department. For non-urgent concerns, contact your pharmacist or GP for advice.

Can Ovex Interact With Other Medicines?

Yes — mebendazole can interact with certain other medicines. The most clinically significant interactions are with metronidazole (which may increase the risk of serious skin reactions), cimetidine (which may raise mebendazole blood levels), and anti-epileptic medicines such as carbamazepine or phenytoin (which may reduce the effectiveness of mebendazole). Always tell your pharmacist about every medicine, supplement, or herbal remedy you are currently taking before starting Ovex.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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