13 Nov 2017: Dr Fox has temporarily suspended the supply of trimethoprim for cystitis. Trimethoprim cannot currently be ordered. This is because of increasing antibiotic resistance to trimethoprim. We are looking at supplying a more effective antibiotic, nitrofurantoin, and hope to have this available within a few weeks.

Cystitis treatment

Treat the causes and symptoms of cystitis including recurring infections – be prepared with standby trimethoprim antibiotic for the treatment of cystitis.

Read medical information and answer medical questions to buy treatment online.

Treatment available


Trimethoprim 200mg

6 tablets (1 course) £9.50

Buy treatment


Cystitis treatmentQuantityCost
Trimethoprim 200mg6 tablets (1 course of treatment)£9.50

Prescription issued online - small prescription fee per order.

Compare prices: Dr Fox prices are 25%-50% lower cost than other online clinics.

Prescription fees

Dr Fox supplies medicine on prescription and charges a small prescription fee based on the order value of each prescription.

Prescriptions are issued by our doctors online and sent electronically to our pharmacy.

If you have your own private or NHS paper prescription please post to our pharmacy (details).

Dr Fox prices are 25%–50% lower than other UK online clinics.

Order valuePrescription fee
up to £10£1.00
up to £20£3.00
up to £50£5.00
up to £100£8.00
over £100£10.00
Comparative costs of Trimethoprim 200mg x 6 from UK online clinics (13 September 2016) - qualifying notes
*Dr Fox adds a small prescription fee not included in table above.
  1. The prices shown are listed by the online clinics named after a customer first enters consultation information and is offered prescriptions. It is possible these clinics may have special offers or lower prices for repeat supplies.
  2. Prices may change and are, to the best of our knowledge, accurate on the date stated.
  3. Dr Fox does NOT claim to provide a superior service to any of the online clinics listed. All the clinics listed, as far as we can tell, comply with all regulation and, as far as we can tell, operate to high ethical standards.
  4. Dr Fox adds a small prescription fee not included in the table (between £1 and £10 depending on value of the order).
  5. To amend the information in this table please contact us
  6. The prices listed in the table do not identify the cost of prescription medicine as online clinics charge a single fee to cover services which includes advice, consultations, prescriptions and dispensing and supply of treatments.
ItemsDr FoxPharmacy2USuperdrugExpress PharmacyLloydsMed Express
Trimethoprim 200mg x 6£9.50£15.00£23.00£19.99£19.99£19.99
UK delivery£2.90£3.45included£2.95included£2.90

Delivery charges

UK delivery only: £2.90 per consultation via Royal Mail 24 Signed For (1-4 working days).

Parcel forwarding services are not permitted.

Medical information


Cystitis is a troublesome condition arising from infection in the urine. It usually resolves quickly with antibiotic. Some women are prone to repeated episodes of cystitis. Men rarely suffer from cystitis and the treatment offered here is not for men.

Cystitis symptoms

  • Cystitis is usually associated with burning and soreness when passing water (doctors call this dysuria)
  • There is usually a need to pass water frequently, sometimes many times in an hour
  • During a water infection it is usually not possible to delay passing urine when there is an urge to go (urgency)


Sometime the frequency of cystitis infections can be reduced by wearing natural fibre rather than synthetics next to the skin. Drinking plenty each day also helps to keep the bladder flushed and can help to reduce infections. Passing water after intercourse can help for women who tend to get infections after intercourse. These simple measures maybe helpful in preventing infection, although often they are not.

Recurring infection

Doctors often can not find out why a woman is getting repeated episodes of cystitis. When a woman first starts having these infections tests are sometimes carried out. The tests are usually normal.

In some women cystitis is associated with recent intercourse or can be associated with stress. However, most water infections seem to start for no particular reason. If a woman has repeated episodes of cystitis, and the pattern of infection and symptoms are not changing, doctors usually just treat each infection as it arises with antibiotic.

Treating cystitis with trimethoprim

Trimethoprim will cure cystitis infections in about 60% to 85% of cases. The success rate varies from one part of the UK to another. Trimethoprim is the antibiotic doctors prescribe most frequently for cystitis (200mg every 12 hours for 3 days).

When Trimethoprim is ineffective, or not suitable, other antibiotic can be tried. During infection it also helps to drink plenty, about 4 litres or 5-6 pints a day. Citrate sachets, available from chemists, that de-acidify the urine, can also help.

Other antibiotics commonly used to treat cystitis include ciprofloxacin, norfloxacin, ofloxacin, co-amoxiclav (Augmentin), and nitrofurantoin. These antibiotics are sometimes a first choice or are an alternative to trimethoprim. They are not available from Dr Fox.

Service aimed at

Standby antibiotic treatment is only for those women who are prone to cystitis and have already been diagnosed with it in the past. You should only use this treatment if you are confident you know when you have cystitis.

Only take antibiotic if you have pain on passing urine, frequency of passing urine and blood in the urine, or severe symptoms.

This service is not for the treatment of cystitis that has already started. If cystitis symptoms have already started see a doctor face-to-face. This will guarantee there is no delay in starting treatment.

Patients are required to provide their GP details. Dr Fox will inform the surgery of supply of treatment.

Response to treatment

Simple cystitis will improve greatly within 24 hours of starting antibiotics. If symptoms are not improving in the first 24 hours, or have not gone completely at the end of 3 days, medical advice is needed. If symptoms worsen rather than improve medical advice is needed straightaway.

Complications and cautions

Infection can travel up from the bladder into the kidney. This is known as pyelonephritis and requires urgent medical attention and sometimes hospital treatment.

Any of the following symptoms may indicate serious pylonephritis:

  • Back pain (indication of possible infection in the kidney)
  • Fever (high temperature, flushing, shivering, feeling hot and cold)
  • Nausea and sickness and loss of appetite
  • Generalised aching and flu-like feeling and collapse

All the above symptoms suggest something more serious than a simple cystitis and the need to seek medical advice straight away.

Trimethoprim side effects

Most people taking trimethoprim experience no, or very mild, side effects. There may be gastrointestinal upsets, such as indigestion, loose stools and rashes. If a rash develops trimethoprim should be stopped and medical advice sought.

Antibiotic guardianship

Antibiotic Guardian logo

To combat antibiotic resistance please:

  • Only use antibiotics when needed
  • Never share antibiotics
  • Always complete course as instructed
  • Take unused medicine to local pharmacy for disposal

Buy treatment

Dr Fox supplies trimethoprim 200mg tablets on prescription – you are required to answer a short medical questionnaire before your order can be completed.

Authored 18 February 2010 by Dr Tony Steele, MB ChB

Reviewed 28 November 2016 by Dr B. Babor, MB ChB

Last updated 13 November 2017

  1. Medical questions
  2. Choose treatment
  3. Complete order
13 Nov 2017: Dr Fox has temporarily suspended the supply of trimethoprim for cystitis. Trimethoprim cannot currently be ordered. This is because of increasing antibiotic resistance to trimethoprim. We are looking at supplying a more effective antibiotic, nitrofurantoin, and hope to have this available within a few weeks.

Answer medical questions to order(cystitis)

Women only

Have you read the medical information?

See medical information
Please note, we provide this antibiotic for women only NOT men.

Have you been diagnosed with cystitis in the past?

Are you aware Dr Fox supplies 'standby' treatment only for cystitis?

  • If you already have symptoms Dr Fox postal service will take too long
  • Women who have cystitis symptoms already should contact their GP

Are you allergic to trimethoprim or septrim (co-trimoxazole)?

Have you been diagnosed with kidney damage or are you having dialysis treatment?

Have you been diagnosed with any blood disorders including anaemia and folic acid deficiency?

Are you taking any of the following medications?

  • Existing antibiotics - trimethoprim not to be taken with other antibiotics
  • Amiodarone - for irregular heart
  • Anticoagulants - for thinning the blood - includes warfarin
  • Ciclosporin - to prevent rejection after transplantation
  • Digoxin - for irregular heart and heart failure
  • Phenytoin - for epilepsy and fits 
  • Pyrimethamine - malaria treatment
  • Azothioprine - taken to suppress immunity
  • Methotrexate

Do you intend to take trimethoprim whilst pregnant or breast-feeding?

Are you aware the following symptoms would require urgent medical advice?

  • Back pain (symptom of possible kidney infection)
  • Flu like symptoms (fever, nausea and vomiting, rashes and collapse)

Are you aware cystitis symptoms should improve within 24 hours and resolve within 3 days of starting trimethoprim?

Symptoms not improving within 24 or not resolved within 3 days require medical assessment.

Do you have any further relevant questions or medical information for the doctor?

Please enter below:

Do all the following apply to you?

  • I will read the patient information leaflet supplied with my tablets.
  • The tablets are for my own use.
  • I am over 18.
  • I am female (this antibiotic is for women prone to cystitis NOT men)
  • I agree to the terms and conditions

The order process

Answer short medical questionnaire

Choose treatment, register, and pay

Doctor issues prescription online

Medicine posted direct from pharmacy

Independent reviews

“So pleased to see that it is possible to order medication online. The consultation was very easily done and ... the goods arrived very quickly.”05/10/2015 – Trusted Shops

“Very pleased with the service received. A lot of information provided about the products available makes an informed choice straightforward.”05/10/2015 – Trusted Shops

“Very quick delivery, excellent service. I have recommended Dr Fox to others that are having the same problem.”04/10/2015 – Trusted Shops

“Working early mornings until late hours there is no time to see a GP. This was quick and helpful.”08/10/2015 – Trusted Shops

“Second time I have used Dr Fox I highly recommend this service.”10/10/2015 – Trusted Shops

“Fast accurate and hassle free and good price too. Can't see how you can improve on that.”02/10/2015 – Trusted Shops

“Product arrived a day earlier than expected and was exactly what I'd ordered. Will definitely use this site again.”29/09/2015 – Trusted Shops

“Very quick service, keeping you updated at each stage. Will definitely use them again.”30/09/2015 – Trusted Shops

“As usual excellent service but the option for next day delivery would be a good idea.”07/10/2015 – Trusted Shops

“I have been using the service for around 8 months now and had very good service each time. Recommended.”28/09/2015 – Trusted Shops

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