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Canesten Oral Thrush Capsule - 150mg

Canesten Oral Thrush Capsule - 150mg

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  • ✔️ Single 150mg fluconazole capsule clears vaginal thrush fast
  • ✔️ Treats thrush internally via the bloodstream systemically
  • ✔️ Symptom relief often noticed within 24 hours of taking
  • ✔️ Suitable for women aged 16 to 60 with diagnosed thrush
  • ✔️ Convenient one-dose oral treatment — no applicators needed

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What Is a Fluconazole 150mg Capsule Used For?

 

Vaginal thrush is one of the most common fungal infections affecting women in the UK. It is caused by an overgrowth of a yeast called Candida albicans, which naturally lives in the body but can multiply when conditions change. Symptoms include itching, soreness, a thick white discharge, and discomfort during sex or urination. The good news? A single fluconazole 150mg capsule can treat the infection from the inside out, without the need for creams or pessaries. You can browse our full range of treatments in our thrush collection if you want to compare your options.

Canesten Oral Thrush Capsule 150mg contains fluconazole as its active ingredient. It is licensed in the UK as an over-the-counter (OTC) medicine for women aged 16 to 60 who have previously been diagnosed with vaginal thrush by a doctor. It is not a new or experimental treatment — fluconazole has been used clinically for decades and is well-established in NHS guidelines for managing candidal infections.

 

How Does Canesten Oral Thrush Capsule Work?

 

Fluconazole belongs to a class of medicines called triazole antifungals. It works by targeting the fungal cell membrane specifically, which is what makes it effective without causing widespread harm to your body's own cells. Here is how it works step by step:

  • Fluconazole is absorbed into the bloodstream after you swallow the capsule.
  • It inhibits an enzyme called lanosterol 14-alpha-demethylase, which the Candida fungus relies on to produce ergosterol.
  • Ergosterol is essential for maintaining the integrity of the fungal cell membrane.
  • Without ergosterol, the fungal cell membrane becomes leaky and unstable, causing the fungal cells to die.
  • As the fungal population reduces, your symptoms — itching, discharge, and soreness — begin to resolve.

Because it is taken orally, fluconazole reaches the site of infection through the bloodstream rather than being applied locally. This makes it particularly convenient for women who find topical treatments uncomfortable or impractical.

 

Who Is Canesten Oral Thrush Capsule Suitable For?

 

This capsule is designed for women who recognise the symptoms of vaginal thrush and have had the condition confirmed by a doctor on at least one previous occasion. It is not intended for first-time sufferers who have never had a diagnosis, as other conditions can mimic thrush symptoms. It is also worth noting that this is a treatment for vaginal thrush specifically — it is not indicated for oral thrush or other fungal infections in this OTC context.

You may be suitable for this treatment if you:

  • Are a woman aged between 16 and 60 years old.
  • Have previously been diagnosed with vaginal thrush by a healthcare professional.
  • Are experiencing familiar symptoms such as itching, soreness, or white discharge.
  • Are not pregnant, breastfeeding, or taking medicines known to interact with fluconazole.

 

How Does Canesten Oral Capsule Compare to Canesten Pessary?

 

Feature Canesten Oral Capsule 150mg Canesten Pessary 500mg
Active ingredient Fluconazole Clotrimazole
Route of administration Oral (swallowed) Vaginal (inserted)
Number of doses Single capsule Single pessary
Suitable during pregnancy No Yes (with care — seek advice)
Treats internal infection Yes — systemic action Yes — local action

 

How Should You Store Canesten Oral Thrush Capsule?

 

Store the capsule below 25°C in a dry place, away from direct sunlight and moisture. Keep it out of the reach and sight of children at all times. Do not use the capsule after the expiry date printed on the packaging. If you are managing multiple women's health products at home, our women's health collection includes a range of treatments that can be stored safely alongside this capsule.

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.

Canesten Oral Thrush Capsule 150mg specifications
Treatment category Antifungal / Vaginal thrush
Active ingredient Fluconazole 150mg
Mechanism of action Inhibits fungal lanosterol 14-alpha-demethylase, disrupting ergosterol synthesis
Effective against Candida albicans (vaginal thrush)
Suitable for Women aged 16–60 with previously diagnosed vaginal thrush
Pack size 1 capsule
Strength 150mg
UK classification P (Pharmacy medicine)
Drug class Triazole antifungal
Preparation Hard capsule
Route of administration Oral

Specifications of Canesten Oral Thrush Capsule 150mg

 

What Is Canesten Oral Thrush Capsule and What Is It Used For?

 

Canesten Oral Thrush Capsule 150mg is an antifungal medicine used to treat vaginal thrush (also called vaginal candidiasis) in women. It contains fluconazole, a triazole antifungal that works systemically — meaning it travels through your bloodstream to reach and eliminate the Candida fungus causing your infection. It is available over the counter in the UK as a single-dose treatment, making it one of the most convenient options for women who recognise recurring thrush symptoms. If you are also experiencing discomfort around the vaginal area, you may find it helpful to combine this capsule with a topical treatment from our creams and ointments collection.

 

What Do You Need to Know Before Using Canesten Oral Thrush Capsule?

 

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

  • You are under 16 or over 60 years of age.
  • You are pregnant, think you might be pregnant, or are breastfeeding.
  • You have ever had an allergic reaction to fluconazole or any other antifungal medicine.
  • You have liver or kidney problems.
  • You have a weakened immune system (for example, due to HIV or chemotherapy).
  • You have never had vaginal thrush diagnosed by a doctor before.
  • Your symptoms include sores, ulcers, blisters, or an unusual-smelling discharge — these may indicate a different condition.

The following medicines are known to interact with fluconazole. Tell your pharmacist or doctor if you are taking any of these:

  • Warfarin or other anticoagulants (blood thinners)
  • Rifampicin (an antibiotic)
  • Phenytoin (for epilepsy)
  • Ciclosporin (an immunosuppressant)
  • Terfenadine or astemizole (older antihistamines)
  • Certain diabetes medicines such as sulphonylureas
  • Theophylline (for asthma or COPD)

 

How Should You Take Canesten Oral Thrush Capsule?

 

Taking this capsule correctly is straightforward. Follow these steps:

  1. Check the expiry date on the packaging before use.
  2. Swallow the capsule whole with a full glass of water.
  3. You can take it with or without food — it does not matter.
  4. Take only one capsule. This is a single-dose treatment.
  5. Do not take a second capsule unless advised by a doctor.
Indication Age Group Dose Frequency
Vaginal thrush Women aged 16–60 150mg (1 capsule) Single dose
Under 16 or over 60 Not applicable Not suitable OTC Seek GP advice

If your symptoms do not improve within 7 days of taking the capsule, or if they return within two months, you should see your GP. Recurring thrush may require further investigation.

 

What Are the Possible Side Effects of Canesten Oral Thrush Capsule?

 

Like all medicines, fluconazole can cause side effects, although not everyone experiences them. Knowing what to look out for helps you manage your treatment safely.

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

  • Nausea or feeling sick
  • Headache
  • Abdominal pain or stomach discomfort
  • Diarrhoea
  • Indigestion or flatulence

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

  • Dizziness
  • Skin rash or itching
  • Taste disturbance
  • Elevated liver enzymes (detected on blood tests)

Stop taking the capsule and seek immediate medical attention if you develop a severe skin reaction, yellowing of the skin or eyes (jaundice), unusual bruising, or difficulty breathing. These may be signs of a serious allergic reaction or liver problem, both of which require urgent assessment. You can also find information on managing related discomfort in our pain relief collection for mild headaches or abdominal discomfort.

 

How Should You Store Canesten Oral Thrush Capsule?

 

  • Store below 25°C in a cool, 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 blister pack or carton.
  • Do not dispose of medicines via wastewater or household waste — return unused capsules to your pharmacy for safe disposal.

Written and reviewed by our qualified team

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 Canesten Oral Thrush Capsule 150mg online in the UK?

You can buy Canesten Oral Thrush Capsule 150mg directly from Cured Pharmacy, a GPhC-registered online pharmacy in the UK. It is available without a prescription for women aged 16 to 60 who have previously had vaginal thrush diagnosed by a doctor. Browse our full thrush treatment collection for additional options including pessaries and creams.

How does fluconazole 150mg work in the body?

Fluconazole works by inhibiting an enzyme called lanosterol 14-alpha-demethylase, which the Candida fungus needs to produce ergosterol — a vital component of its cell membrane. Without ergosterol, the fungal cell membrane breaks down and the infection cannot survive. This systemic action means the medicine reaches the infection through your bloodstream after you swallow the capsule.

How do I take Canesten Oral Thrush Capsule step by step?

Simply swallow one 150mg capsule whole with a full glass of water. You can take it with or without food, at any time of day. Only one capsule is needed — this is a single-dose treatment, so there is no need to take a course of tablets.

How long does Canesten Oral Capsule take to work?

Many women notice an improvement in symptoms such as itching and soreness within 24 hours of taking the capsule. Full resolution of symptoms, including discharge, may take up to 7 days. If you see no improvement after 7 days, you should consult your GP as the infection may require further assessment.

What are the side effects of Canesten Oral Thrush Capsule and how do I manage them?

The most common side effects include nausea, headache, abdominal pain, and diarrhoea, which are generally mild and short-lived. Taking the capsule with food may help reduce stomach discomfort. If you develop a severe skin rash, yellowing of the skin, or difficulty breathing, stop taking the capsule and seek urgent medical attention.

Can I take Canesten Oral Capsule during pregnancy?

No — Canesten Oral Thrush Capsule is not recommended during pregnancy. Fluconazole has been associated with potential risks to the developing baby, particularly when taken in the first trimester. If you are pregnant or think you might be, speak to your GP or midwife before using any thrush treatment.

Who is not eligible to use Canesten Oral Thrush Capsule?

This capsule is not suitable for women under 16 or over 60, those who are pregnant or breastfeeding, or anyone with liver or kidney problems. It is also not appropriate if you have never had thrush diagnosed before, if you have a weakened immune system, or if you are taking medicines that interact with fluconazole such as warfarin or terfenadine.

What is the difference between Canesten Oral Capsule and Canesten cream?

Canesten Oral Capsule contains fluconazole and is swallowed as a single dose, treating the infection systemically through the bloodstream. Canesten cream contains clotrimazole and is applied externally to relieve itching and soreness around the vaginal area. Both can be used together for faster and more complete symptom relief — the cream addresses external discomfort while the capsule tackles the internal infection.

What happens if I miss a dose of Canesten Oral Thrush Capsule?

Because Canesten Oral Thrush Capsule is a single-dose treatment, there is no "missed dose" in the traditional sense — you simply take the one capsule when you are ready. If you forget to take it on a particular day, take it as soon as you remember. Do not take two capsules to make up for a missed one.

Can I drink alcohol while taking Canesten Oral Thrush Capsule?

There is no specific interaction between fluconazole and alcohol, so a moderate amount of alcohol is unlikely to cause a problem with a single dose. However, alcohol can worsen some side effects such as nausea and dizziness, so it is sensible to drink cautiously around the time you take the capsule. If you are unsure, ask your pharmacist for personalised advice.

What are the alternatives to Canesten Oral Thrush Capsule?

Alternatives include clotrimazole-based treatments such as vaginal pessaries and topical creams, which are applied locally rather than taken orally. You can explore a range of options in our women's health collection. If OTC treatments are not working, your GP may prescribe a longer course of fluconazole or investigate an underlying cause for recurrent thrush.

How long can I keep using Canesten Oral Capsule for recurring thrush?

Canesten Oral Thrush Capsule is intended for occasional use to treat individual episodes of thrush. If you are experiencing four or more episodes per year, this is considered recurrent thrush and you should see your GP rather than repeatedly self-treating. Your doctor may recommend a longer-term antifungal regimen or investigate contributing factors such as diabetes or antibiotic use.

Is Canesten Oral Thrush Capsule the same as a prescription fluconazole capsule?

Yes — the active ingredient and dose are identical. Canesten Oral Thrush Capsule contains 150mg of fluconazole, which is the same dose prescribed by GPs for a single episode of vaginal thrush. The difference is that the OTC version is licensed for self-treatment in women aged 16 to 60 who have previously had thrush diagnosed, whereas prescription fluconazole may be used in a wider range of situations and doses.

Can thrush come back after taking Canesten Oral Capsule?

Yes, thrush can recur even after successful treatment. Common triggers include antibiotic use, hormonal changes, tight synthetic clothing, and high sugar intake. If your symptoms return within two months of treatment, you should see your GP rather than taking another OTC capsule, as recurrent infections may need a different management approach.

What does the latest research say about fluconazole for vaginal thrush?

Fluconazole 150mg as a single oral dose remains a well-established and clinically supported treatment for uncomplicated vaginal candidiasis, consistent with NHS and NICE guidance. Research continues to monitor antifungal resistance patterns in Candida species, though resistance to fluconazole in community-acquired vaginal thrush remains uncommon in the UK. Always follow current NHS guidance and consult your pharmacist or GP if treatments are not working as expected.

How Should You Use Canesten Oral Thrush Capsule?

Using Canesten Oral Thrush Capsule correctly is simple, but it is worth following these steps carefully to make sure you get the most from your treatment. Always read the patient information leaflet inside the pack before taking the capsule.

If your symptoms do not improve within 7 days, or if they worsen at any point, stop self-treating and contact your GP. Do not take a second capsule without medical advice.

What Is the Correct Dose of Canesten Oral Thrush Capsule?

The dose of Canesten Oral Thrush Capsule is fixed — one 150mg capsule taken as a single dose. There is no need to take multiple doses or repeat the treatment unless a healthcare professional specifically advises you to do so. The table below summarises the dosing information for this product.

When Is the Best Time to Use Canesten Oral Thrush Capsule?

There is no specific time of day that is clinically required for taking this capsule — you can take it in the morning, afternoon, or evening, whichever suits you best. However, if you are prone to nausea, taking it with a light meal or snack may help reduce stomach discomfort. Most women choose to take it as soon as they recognise their thrush symptoms, as earlier treatment tends to lead to faster relief.

Avoid taking the capsule if you are unsure whether your symptoms are caused by thrush, particularly if this is the first time you have experienced them. In that case, see your GP for a confirmed diagnosis before starting treatment.

How Long Can You Use Canesten Oral Thrush Capsule For?

Canesten Oral Thrush Capsule is designed for occasional, episodic use — one capsule per episode of vaginal thrush. It is not intended for long-term or preventative use without medical supervision. If you find yourself needing treatment more than twice in six months, or four or more times in a year, this may indicate recurrent thrush, which requires a GP assessment rather than repeated self-treatment.

Your GP may investigate underlying causes such as undiagnosed diabetes, antibiotic use, or hormonal factors, and may recommend a supervised longer-term antifungal regimen if appropriate.

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 Canesten Oral Thrush Capsule?

Most women tolerate Canesten Oral Thrush Capsule well, particularly because it is taken as a single dose. That said, like all medicines, it can cause side effects in some people. The most common ones are generally mild and tend to resolve on their own within a day or two.

  • Nausea or feeling sick
  • Headache
  • Abdominal pain or stomach cramps
  • Diarrhoea
  • Flatulence (wind) or indigestion

Taking the capsule with a light meal may help reduce nausea. Staying well hydrated can also ease headaches. These effects are not usually a reason to stop treatment, but if they are severe or persistent, contact your pharmacist.

What Are the Less Common Side Effects of Canesten Oral Thrush Capsule?

Less commonly, some women experience side effects that are worth being aware of, even if they are unlikely to affect you. These occur in fewer than 1 in 100 people.

  • Dizziness or light-headedness
  • Skin rash or itching unrelated to the thrush itself
  • Altered or unusual taste in the mouth
  • Raised liver enzymes (usually only detected on blood tests)
  • Dry mouth

If you develop a skin rash after taking the capsule, it is important to consider whether this could be an allergic reaction rather than a side effect of the medicine. Mild rashes may settle on their own, but any spreading, blistering, or severe rash should be assessed urgently.

What Are the Serious Side Effects of Canesten Oral Thrush Capsule?

Serious side effects from a single 150mg dose of fluconazole are rare, but they do exist and you should know what to watch for. Stop taking the capsule and seek immediate medical attention if you experience any of the following:

  • Yellowing of the skin or whites of the eyes (jaundice) — a possible sign of liver problems
  • Severe or widespread skin rash, blistering, or peeling
  • Swelling of the face, lips, tongue, or throat (signs of a serious allergic reaction)
  • Difficulty breathing or swallowing
  • Unusual bruising or bleeding
  • Severe dizziness or fainting

These reactions are uncommon but require urgent medical assessment. Do not wait to see if they improve on their own.

What Should You Do If You Experience Side Effects?

For mild side effects such as nausea or headache, rest, hydration, and taking the capsule with food are usually sufficient. If a side effect is bothering you or does not settle within 48 hours, speak to your pharmacist — they can advise whether you need further assessment. You can also report side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk.

Never take a second capsule to try to speed up recovery from side effects. If you are concerned that your symptoms are worsening rather than improving, contact your GP.

Can Canesten Oral Thrush Capsule Interact With Other Medicines?

Yes — fluconazole is known to interact with several medicines, some of which can cause serious problems. The most clinically significant interactions include warfarin (fluconazole can increase its anticoagulant effect), terfenadine and astemizole (risk of serious heart rhythm problems), phenytoin, rifampicin, ciclosporin, and certain diabetes medicines. Always tell your pharmacist about every medicine you are taking, including herbal remedies and supplements, before using this capsule.

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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