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Canesten CanesOasis Cystitis Relief - 6 Sachets

Canesten CanesOasis Cystitis Relief - 6 Sachets

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  • ✔️ Relieves cystitis burning and stinging with sodium citrate
  • ✔️ Alkalises urine to reduce painful urination fast
  • ✔️ Six-sachet pack provides a full two-day treatment course
  • ✔️ Suitable for women aged 16 and over without a prescription
  • ✔️ No-fuss oral sachets — simply dissolve in water and drink

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What Are Canesten CanesOasis Cystitis Relief Sachets?

 

If you have ever had cystitis, you will know just how uncomfortable it can be. That burning sensation when you urinate, the constant urge to go, and the general feeling of misery — it can really disrupt your day. Cystitis relief sachets like Canesten CanesOasis are a well-established, pharmacy-recommended option for easing those symptoms quickly, without needing a prescription. Each pack contains 6 sachets, giving you a full two-day course at the standard dosing schedule.

Cystitis is one of the most common urinary tract infections (UTIs) in women, with the NHS estimating that around half of all women will experience it at least once in their lifetime. The condition is caused by bacteria — most commonly Escherichia coli — entering the bladder and causing inflammation. You can browse our full range of cystitis and bladder infection treatments if you want to compare your options before buying.

 

How Does Canesten CanesOasis Work to Relieve Cystitis?

 

The active ingredient in CanesOasis is sodium citrate, at a dose of 4g per sachet. Sodium citrate is an alkalising agent — it works by raising the pH of your urine, making it less acidic. Acidic urine is what causes that characteristic burning and stinging when you pass water during a bout of cystitis. By neutralising the acidity, the discomfort is reduced while your body works to clear the infection.

  • Sodium citrate is absorbed from the gut into the bloodstream
  • It is then excreted by the kidneys into the urine
  • This raises urinary pH, reducing acidity
  • Less acidic urine means less irritation to the inflamed bladder lining

It is worth noting that CanesOasis treats the symptoms of cystitis — it does not kill bacteria. If your symptoms do not improve within two days, or if you develop a fever, back pain, or feel generally unwell, you should see a GP, as you may need antibiotic treatment.

 

Who Should Use Canesten CanesOasis Cystitis Relief Sachets?

 

CanesOasis is designed for adults aged 16 and over who are experiencing the typical symptoms of mild, uncomplicated cystitis. It is particularly suited to women, who are far more likely to develop cystitis due to their shorter urethra. Men who develop UTI symptoms should always see a GP, as the cause is more likely to require investigation.

  • Women aged 16 and over with mild cystitis symptoms
  • Those experiencing burning or stinging when urinating
  • People with increased urinary frequency or urgency
  • Those who want fast symptom relief without a prescription

 

How Does Canesten CanesOasis Compare to Other Cystitis Treatments?

 

Feature Canesten CanesOasis Prescription Antibiotics (e.g. Trimethoprim)
Prescription needed? No — available OTC Yes
Mechanism Alkalises urine to reduce symptoms Kills bacteria causing infection
Treats infection? No — symptom relief only Yes — targets bacterial cause
Suitable for mild, uncomplicated cystitis? Yes Yes, if confirmed bacterial UTI

 

Is Canesten CanesOasis Suitable for Everyone, and How Should It Be Stored?

 

Not everyone can use cystitis relief sachets without checking first. CanesOasis is not suitable for people with kidney disease, those on a sodium-restricted diet, or anyone with elevated blood potassium levels (hyperkalaemia). Pregnant or breastfeeding women should speak to their GP before use, as cystitis in pregnancy can carry additional risks and may require antibiotic treatment. If you are managing other conditions alongside a UTI, our women's health range includes a variety of relevant products worth exploring.

Store CanesOasis sachets below 25°C in a dry place, away from direct sunlight. Keep them out of reach of children. Do not use after the expiry date printed on the packaging.

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 CanesOasis Cystitis Relief - 6 Sachets specifications
Treatment category Urinary tract / cystitis relief
Mechanism of action Urinary alkalising agent — raises urinary pH to reduce acidity
Effective for Burning, stinging, and frequency associated with cystitis
Suitable for Adults aged 16 and over (primarily women)
Active ingredient Sodium citrate 4g per sachet
Pack size 6 sachets
UK classification General Sale Medicine (GSL)
Drug class Urinary alkalising agent
Preparation Oral powder for solution
Route of administration Oral (dissolved in water)

Specifications of Canesten CanesOasis Cystitis Relief - 6 Sachets

 

What Is Canesten CanesOasis and What Is It Used For?

 

Canesten CanesOasis Cystitis Relief is an over-the-counter oral medicine used to relieve the symptoms of cystitis in adults aged 16 and over. Each sachet contains 4g of sodium citrate, a urinary alkalising agent that reduces the acidity of urine. This helps to ease the burning, stinging, and discomfort that occur when the bladder lining becomes inflamed — typically as a result of a bacterial infection.

Cystitis symptoms can include a burning sensation when urinating, needing to urinate more frequently than usual, passing only small amounts of urine, and urine that appears cloudy or has an unpleasant smell. CanesOasis does not treat the underlying bacterial infection — it provides symptomatic relief while your immune system works to resolve mild, uncomplicated cases.

 

What Do You Need to Know Before Using Canesten CanesOasis?

 

Before using CanesOasis, it is important to check whether it is appropriate for you. There are several situations where you should not use this product without first speaking to a healthcare professional.

Do not use CanesOasis if you:

  • Are under 16 years of age
  • Have kidney disease or impaired kidney function
  • Are on a sodium-restricted diet
  • Have high blood potassium levels (hyperkalaemia)
  • Are pregnant or breastfeeding (seek GP advice first)
  • Have symptoms suggesting a kidney infection — such as fever, chills, back or loin pain, or vomiting
  • Are a man with urinary symptoms (always see a GP)
  • Have had more than 2 episodes of cystitis in the past 6 months

Possible interactions to be aware of:

  • Potassium-sparing diuretics (e.g. spironolactone) — sodium citrate may affect potassium balance
  • Lithium — urinary alkalisation can affect lithium excretion; seek medical advice
  • Some antibiotics — absorption may be affected; check with your pharmacist

 

How Should You Use Canesten CanesOasis?

 

Using CanesOasis correctly is straightforward, but it is important to follow the instructions carefully to get the most benefit and avoid taking too much sodium. Drink plenty of water throughout the day — at least 6 to 8 glasses — as this helps flush bacteria from the bladder and supports recovery.

  1. Empty one sachet into a glass
  2. Add approximately 200ml (one full glass) of cold water
  3. Stir well until the powder is fully dissolved
  4. Drink the solution immediately
  5. Repeat every 8 hours as needed
  6. Do not take more than 3 sachets in any 24-hour period
  7. Do not use for more than 2 days without seeking medical advice
Indication Age Group Dose Frequency
Cystitis symptom relief Adults 16+ 1 sachet (4g sodium citrate) in 200ml water Every 8 hours, max 3 sachets per day, for up to 2 days
Children under 16 Under 16 Not suitable Not applicable

 

What Are the Possible Side Effects of Canesten CanesOasis?

 

CanesOasis is generally well tolerated when used as directed. Side effects are uncommon, but as with any medicine, some people may experience them. If you are also managing other conditions, it may be worth exploring our pain relief range for additional comfort measures alongside your cystitis treatment.

Common side effects:

  • Mild nausea
  • Stomach discomfort or bloating
  • Diarrhoea (if taken in large amounts)

Less common side effects:

  • Headache
  • Increased thirst
  • Mild oedema (fluid retention) — particularly relevant if you are on a sodium-restricted diet

Stop using CanesOasis and seek medical attention immediately if you experience chest pain, difficulty breathing, severe abdominal pain, or signs of an allergic reaction such as swelling of the face, lips, or throat.

 

How Should You Store Canesten CanesOasis?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and moisture
  • Keep out of the sight and reach of children
  • Do not use after the expiry date printed on the outer carton
  • Do not store in a bathroom cabinet — humidity can affect the powder
  • Once dissolved in water, use immediately and do not store the solution

If you have any unused sachets after completing your course, dispose of them responsibly — your local pharmacy can accept unwanted medicines for safe disposal. For ongoing urinary health support, you might also find our vitamins and supplements range useful, particularly products containing cranberry extract, which some people use as a preventative measure.

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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 Canesten CanesOasis cystitis relief sachets online in the UK?

You can buy Canesten CanesOasis directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £5.99 per pack of 6 sachets. It is also available from most high street pharmacies and larger supermarkets without a prescription. Browse our full cystitis and bladder infection range for more treatment options.

How do Canesten CanesOasis cystitis relief sachets work in the body?

Each sachet contains 4g of sodium citrate, which is absorbed from the digestive tract and excreted by the kidneys into the urine. This raises the pH of your urine, making it less acidic and reducing the burning and stinging sensation that cystitis causes. It does not kill bacteria — it simply makes urinating less painful while your body fights the infection.

How do I use Canesten CanesOasis step by step?

Dissolve one sachet in a full glass of cold water (around 200ml), stir until completely dissolved, and drink it straight away. You can repeat this every 8 hours, but do not take more than 3 sachets in any 24-hour period. Continue for up to 2 days — if symptoms persist beyond this, see your GP.

How quickly does Canesten CanesOasis start to work?

Many people notice a reduction in burning and stinging within a few hours of taking the first sachet, though individual responses vary. Drinking plenty of water alongside the sachets can help speed up symptom relief by flushing the bladder. If you see no improvement after 2 days, contact your GP as you may need antibiotic treatment.

What are the side effects of Canesten CanesOasis?

Side effects are uncommon but can include mild nausea, stomach discomfort, or loose stools if taken in excess. Rarely, some people may experience headache or mild fluid retention due to the sodium content. Stop use and seek medical advice if you experience any severe or unexpected symptoms.

Who is eligible to use Canesten CanesOasis?

CanesOasis is suitable for women aged 16 and over with mild, uncomplicated cystitis symptoms such as burning, stinging, and increased urinary frequency. It is not suitable for men, children under 16, pregnant or breastfeeding women (without GP advice), or people with kidney disease or a sodium-restricted diet. Men with urinary symptoms should always consult a GP.

Can I use Canesten CanesOasis while pregnant?

Pregnant women should not use CanesOasis without first speaking to their GP or midwife, as cystitis during pregnancy carries additional risks and often requires antibiotic treatment to prevent the infection spreading to the kidneys. Self-treating with sodium citrate alone may not be sufficient during pregnancy. Always seek professional advice promptly if you suspect a UTI while pregnant.

What is the correct dose of Canesten CanesOasis?

The standard dose for adults aged 16 and over is one sachet (4g sodium citrate) dissolved in 200ml of water, taken every 8 hours. The maximum dose is 3 sachets in any 24-hour period, and the maximum treatment duration is 2 days. Do not exceed this dose without medical guidance.

What happens if I miss a dose of Canesten CanesOasis?

If you miss a dose, simply take the next sachet when you remember, then continue at 8-hourly intervals as normal. Do not take two sachets at once to make up for a missed dose. Staying well hydrated throughout the day will also help manage your symptoms in the meantime.

How long can you use Canesten CanesOasis for?

CanesOasis should not be used for more than 2 days continuously without seeking medical advice. If your symptoms have not resolved after 2 days, or if they worsen at any point, you should see your GP — you may have a bacterial infection that requires antibiotics. Repeated or frequent cystitis episodes should also be discussed with a doctor.

What are the alternatives to Canesten CanesOasis for cystitis?

Other sodium citrate-based sachets such as Effercitrate offer a similar mechanism of action and are available OTC. For confirmed bacterial cystitis, prescription antibiotics such as trimethoprim or nitrofurantoin are the standard treatment. You can explore our women's health range for additional products that may support urinary health.

Can I take Canesten CanesOasis with other medicines?

CanesOasis may interact with potassium-sparing diuretics (such as spironolactone) and lithium, as sodium citrate can affect how these medicines are processed by the kidneys. It may also affect the absorption of some antibiotics. Always tell your pharmacist about any other medicines you are taking before using CanesOasis.

Is Canesten CanesOasis the same as other sodium citrate sachets?

Yes — CanesOasis contains the same active ingredient (sodium citrate 4g) as other branded and own-brand cystitis relief sachets available in the UK. The key differences between products are typically flavouring, excipients, and price. All sodium citrate sachets work by alkalising the urine to reduce discomfort.

What are the latest studies on sodium citrate for cystitis relief?

Sodium citrate has been used as a urinary alkalising agent for decades and remains a recognised OTC option for symptomatic relief of mild cystitis in the UK. Current NHS guidance acknowledges that while antibiotics are the definitive treatment for bacterial UTIs, urinary alkalising agents can provide short-term symptomatic relief. Research continues to focus on antibiotic stewardship and reducing unnecessary prescribing for uncomplicated UTIs.

Can cystitis go away on its own without treatment?

Mild cystitis can sometimes resolve on its own within a few days, particularly in otherwise healthy women. The NHS recommends drinking plenty of fluids, taking over-the-counter pain relief such as paracetamol, and using cystitis relief sachets to ease discomfort. However, if symptoms persist beyond 2 days, worsen, or are accompanied by fever or back pain, you should see a GP promptly.

How Should You Use Canesten CanesOasis?

Using CanesOasis correctly is simple, but following the steps carefully ensures you get the most relief and avoid taking more sodium than necessary. Always read the patient information leaflet supplied with the pack before use, and drink plenty of water throughout the day to help flush the bladder.

What Is the Correct Dose of Canesten CanesOasis?

The recommended dose for adults is one sachet every 8 hours, providing 4g of sodium citrate per dose. Do not exceed 3 sachets in any 24-hour period, and do not use for more than 2 consecutive days without medical advice.

When Is the Best Time to Use Canesten CanesOasis?

There is no specific time of day that is clinically preferred — the key is to space your doses evenly, approximately 8 hours apart, to maintain a consistent alkalising effect on your urine throughout the day. Many people find it helpful to take the first sachet as soon as symptoms begin, then set reminders for the subsequent doses. Taking each sachet with a full glass of water and continuing to drink fluids regularly between doses will support the best outcome.

How Long Can You Use Canesten CanesOasis For?

CanesOasis is intended for short-term use only — a maximum of 2 days. If your symptoms have not improved within 48 hours, or if they worsen at any point, you should stop using the sachets and consult your GP. Persistent or recurrent cystitis may indicate an underlying condition or a bacterial infection that requires antibiotic treatment. Do not use CanesOasis as a long-term preventative measure.

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 CanesOasis?

Canesten CanesOasis is generally well tolerated when used as directed. Most people complete the two-day course without experiencing any significant side effects. However, as with any medicine, some people may notice mild reactions, particularly related to the digestive system.

  • Mild nausea
  • Stomach discomfort or bloating
  • Loose stools or mild diarrhoea (more likely if the dose is exceeded)

What Are the Less Common Side Effects of Canesten CanesOasis?

Less commonly, some people may experience side effects related to the sodium content of the sachets, particularly if they are sensitive to sodium or are taking other medicines that affect fluid balance.

  • Headache
  • Increased thirst
  • Mild fluid retention or oedema — particularly relevant for those on a sodium-restricted diet
  • A temporary change in urine colour or smell as the pH shifts

What Are the Serious Side Effects of Canesten CanesOasis?

Serious side effects are rare but require immediate medical attention. Stop using CanesOasis straight away and seek emergency help if you experience any of the following:

  • Signs of an allergic reaction — swelling of the face, lips, tongue, or throat; difficulty breathing; skin rash or hives
  • Severe abdominal pain
  • Chest pain or palpitations
  • Muscle weakness or cramps (which could indicate electrolyte imbalance)

What Should You Do If You Experience Side Effects of Canesten CanesOasis?

For mild side effects such as nausea or stomach discomfort, try taking the sachet with a larger volume of water or after a light meal. If side effects are persistent or troublesome, stop using the product and speak to your pharmacist. You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps improve medicine safety information for everyone.

Can Canesten CanesOasis Interact With Other Medicines?

CanesOasis can interact with certain medicines due to its sodium citrate content and its effect on urinary pH. The most clinically significant interactions include potassium-sparing diuretics (such as spironolactone or amiloride), which when combined with sodium citrate may affect potassium levels in the blood. Lithium excretion can also be altered by changes in urinary pH, so people taking lithium should seek medical advice before use. Some antibiotics may also be affected — always inform your pharmacist of all medicines you are currently taking before starting CanesOasis.

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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